Enable mypy @deprecated decorator warnings

Currently it's not enabled by default. See:
https://mypy.readthedocs.io/en/stable/changelog.html#support-for-deprecated-decorator-pep-702

Author: bluetech

pyproject.toml

@@ -532,6 +532,7 @@ warn_unreachable = true
 warn_unused_configs = true
 no_implicit_reexport = true
 warn_unused_ignores = true
+enable_error_code = [ "deprecated" ]
 
 [tool.pyright]
 include = [

src/_pytest/logging.py

@@ -513,7 +513,7 @@ def _force_enable_logging(
 
         if isinstance(level, str):
             # Try to translate the level string to an int for `logging.disable()`
-            level = logging.getLevelName(level)
+            level = logging.getLevelName(level)  # type: ignore[deprecated]
 
         if not isinstance(level, int):
             # The level provided was not valid, so just un-disable all logging.