Bump mypy from 1.17.1 to 1.18.1 in /demos (#1620)

Bumps [mypy](https://github.com/python/mypy) from 1.17.1 to 1.18.1.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.17.1...v1.18.1)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.18.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

demos/graphql-demo/requirements-dev.txt

@@ -10,7 +10,7 @@ graphql-ws==0.4.4
 psycopg2-binary==2.9.10
 redis==6.4.0
 
-mypy==1.17.1
+mypy==1.18.1
 flake8==7.3.0
 pytest==8.4.2
 pytest-cov==7.0.0

demos/moderator/requirements-dev.txt

@@ -11,7 +11,7 @@ flake8==7.3.0
 flake8-bugbear==24.12.12
 flake8-quotes==3.4.0
 ipdb==0.13.13
-mypy==1.17.1
+mypy==1.18.1
 pytest==8.4.2
 pytest-aiohttp==1.1.0
 pytest-asyncio==0.26.0