Bump mypy from 1.12.1 to 1.15.0 (#73)

Bumps [mypy](https://github.com/python/mypy) from 1.12.1 to 1.15.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.12.1...v1.15.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.15.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

setup.cfg

@@ -48,7 +48,7 @@ install_requires =
 [options.extras_require]
 testing =
   coverage == 6.2
-  mypy == 1.12.1
+  mypy == 1.15.0
 
 [options.entry_points]
 pytest11 =