chore(deps-dev): bump mypy from 1.14.1 to 1.15.0 in /requirements

Bumps [mypy](https://github.com/python/mypy) from 1.14.1 to 1.15.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.14.1...v1.15.0)

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

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

requirements/dev.txt

@@ -9,7 +9,7 @@ pytest-cov==5.0.0; python_version<"3.9"
 # type checking and related stubs
 # mypy adds new rules in new minor versions, which could cause our PR check to fail
 # here we fix its version and upgrade it manually in the future
-mypy==1.14.1
+mypy==1.15.0
 types-pywin32==308.0.0.20250128; python_version>="3.9"
 types-pywin32==308.0.0.20241221; python_version<"3.9"
 types-PyYAML==6.0.12.20241230