Bump mypy from 1.19.1 to 1.20.0 (#301)

Bumps [mypy](https://github.com/python/mypy) from 1.19.1 to 1.20.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.19.1...v1.20.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.20.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -31,7 +31,7 @@ dev = [
     "aioresponses==0.7.8",
     "codespell==2.4.2",
     "coverage==7.13.5",
-    "mypy==1.19.1",
+    "mypy==1.20.0",
     "pre-commit==4.5.1",
     "pytest-aiohttp==1.1.0",
     "pytest-cov==7.1.0",