Bump mypy from 1.8.0 to 1.9.0 (#289)

Bumps [mypy](https://github.com/python/mypy) from 1.8.0 to 1.9.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.8.0...1.9.0)

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

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

pyproject.toml

@@ -30,7 +30,7 @@ dev = [
     "flake8==7.0.0",
     "flake8-bugbear==24.2.6",
     "flit==3.9.0",
-    "mypy==1.8.0",
+    "mypy==1.9.0",
     "ufmt==2.5.1",
     "usort==1.0.8.post1",
 ]