Bump pytest-asyncio and pluggy to fix warnings

[hugovk]

The 3.14 tests show:

❯ tox -e py314
py314: venv> /Library/Frameworks/Python.framework/Versions/3.14/bin/uv venv -p /Library/Frameworks/Python.framework/Versions/3.14/bin/python3 --allow-existing --python-preference system /Users/hugo/github/release-tools/.tox/py314
py314: install_deps> /Library/Frameworks/Python.framework/Versions/3.14/bin/uv pip install -r dev-requirements.txt -r requirements.txt
py314: commands[0]> .tox/py314/bin/python -m pytest -vv tests/ --cov . --cov tests --cov-report html --cov-report term --cov-report xml
/Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pluggy/_callers.py:141: SyntaxWarning: 'return' in a 'finally' block
  return result
/Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pluggy/_callers.py:182: SyntaxWarning: 'return' in a 'finally' block
  return outcome.get_result()
========================================================= test session starts ==========================================================
platform darwin -- Python 3.14.2, pytest-8.4.2, pluggy-1.5.0 -- /Users/hugo/github/release-tools/.tox/py314/bin/python

And:

=========================================================== warnings summary ===========================================================
tests/test_add_to_pydotorg.py::test_slug_for[3.9.0a0-390-a0]
  /Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pytest_asyncio/plugin.py:1153: DeprecationWarning: 'asyncio.get_event_loop_policy' is deprecated and slated for removal in Python 3.16
    return asyncio.get_event_loop_policy()

tests/test_buildbotapi.py::test_buildbotapi_authenticate
tests/test_buildbotapi.py::test_buildbotapi_all_builders
tests/test_buildbotapi.py::test_buildbotapi_all_builders_with_branch
tests/test_buildbotapi.py::test_buildbotapi_stable_builders
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/success.json-False]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/failure.json-True]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/no-builds.json-False]
  /Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pytest_asyncio/plugin.py:844: DeprecationWarning: 'asyncio.get_event_loop_policy' is deprecated and slated for removal in Python 3.16
    _restore_event_loop_policy(asyncio.get_event_loop_policy()),

tests/test_buildbotapi.py::test_buildbotapi_authenticate
tests/test_buildbotapi.py::test_buildbotapi_all_builders
tests/test_buildbotapi.py::test_buildbotapi_all_builders_with_branch
tests/test_buildbotapi.py::test_buildbotapi_stable_builders
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/success.json-False]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/failure.json-True]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/no-builds.json-False]
  /Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pytest_asyncio/plugin.py:1125: DeprecationWarning: 'asyncio.set_event_loop_policy' is deprecated and slated for removal in Python 3.16
    asyncio.set_event_loop_policy(new_loop_policy)

tests/test_buildbotapi.py::test_buildbotapi_authenticate
tests/test_buildbotapi.py::test_buildbotapi_all_builders
tests/test_buildbotapi.py::test_buildbotapi_all_builders_with_branch
tests/test_buildbotapi.py::test_buildbotapi_stable_builders
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/success.json-False]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/failure.json-True]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/no-builds.json-False]
  /Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pytest_asyncio/plugin.py:1126: DeprecationWarning: 'asyncio.get_event_loop_policy' is deprecated and slated for removal in Python 3.16
    loop = asyncio.get_event_loop_policy().new_event_loop()

tests/test_buildbotapi.py::test_buildbotapi_authenticate
tests/test_buildbotapi.py::test_buildbotapi_all_builders
tests/test_buildbotapi.py::test_buildbotapi_all_builders_with_branch
tests/test_buildbotapi.py::test_buildbotapi_stable_builders
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/success.json-False]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/failure.json-True]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/no-builds.json-False]
  /Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pytest_asyncio/plugin.py:859: DeprecationWarning: 'asyncio.get_event_loop_policy' is deprecated and slated for removal in Python 3.16
    policy = asyncio.get_event_loop_policy()

tests/test_buildbotapi.py::test_buildbotapi_authenticate
tests/test_buildbotapi.py::test_buildbotapi_all_builders
tests/test_buildbotapi.py::test_buildbotapi_all_builders_with_branch
tests/test_buildbotapi.py::test_buildbotapi_stable_builders
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/success.json-False]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/failure.json-True]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/no-builds.json-False]
  /Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pytest_asyncio/plugin.py:904: DeprecationWarning: 'asyncio.get_event_loop_policy' is deprecated and slated for removal in Python 3.16
    policy = asyncio.get_event_loop_policy()

tests/test_buildbotapi.py::test_buildbotapi_authenticate
tests/test_buildbotapi.py::test_buildbotapi_all_builders
tests/test_buildbotapi.py::test_buildbotapi_all_builders_with_branch
tests/test_buildbotapi.py::test_buildbotapi_stable_builders
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/success.json-False]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/failure.json-True]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/no-builds.json-False]
  /Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pytest_asyncio/plugin.py:928: DeprecationWarning: 'asyncio.set_event_loop_policy' is deprecated and slated for removal in Python 3.16
    asyncio.set_event_loop_policy(previous_policy)

tests/test_buildbotapi.py::test_buildbotapi_authenticate
tests/test_buildbotapi.py::test_buildbotapi_all_builders
tests/test_buildbotapi.py::test_buildbotapi_all_builders_with_branch
tests/test_buildbotapi.py::test_buildbotapi_stable_builders
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/success.json-False]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/failure.json-True]
tests/test_buildbotapi.py::test_buildbotapi_is_builder_failing_currently_yes[tests/buildbotapi/no-builds.json-False]
  /Users/hugo/github/release-tools/.tox/py314/lib/python3.14/site-packages/pytest_asyncio/plugin.py:940: DeprecationWarning: 'asyncio.get_event_loop_policy' is deprecated and slated for removal in Python 3.16
    policy = asyncio.get_event_loop_policy()

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
...

Bump with these commands to fix:

pip-compile --generate-hashes --output-file=dev-requirements.txt dev-requirements.in --upgrade-package "pytest-asyncio"
pip-compile --generate-hashes --output-file=dev-requirements.txt dev-requirements.in --upgrade-package "pluggy"