Bump mypy from 1.6.0 to 1.15.0

Bumps [mypy](https://github.com/python/mypy) from 1.6.0 to 1.15.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.6.0...v1.15.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/local.txt

@@ -2,7 +2,7 @@
 
 # Testing
 # ------------------------------------------------------------------------------
-mypy==1.6.0  # https://github.com/python/mypy
+mypy==1.15.0  # https://github.com/python/mypy
 django-stubs==5.1.3  # https://github.com/typeddjango/django-stubs
 pytest==7.4.2  # https://github.com/pytest-dev/pytest