Bump mypy from 1.19.1 to 1.20.2

Bumps [mypy](https://github.com/python/mypy) from 1.19.1 to 1.20.2.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.19.1...v1.20.2)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.20.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -36,7 +36,7 @@ dev = [
     "pre-commit",
     "tox==4.53.0",
     "ruff==0.15.11",
-    "mypy==1.19.1",
+    "mypy==1.20.2",
     "pytest==9.0.3",
     "pytest-cov==7.0.0",
     "pytest-django==4.12.0",