chore(deps-dev): bump mypy from 1.18.2 to 1.19.1 in /requirements (#8533)

Bumps [mypy](https://github.com/python/mypy) from 1.18.2 to 1.19.1.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.18.2...v1.19.1)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.19.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

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==1.18.2
+mypy==1.19.1
 types-pywin32==311.0.0.20251008; python_version>="3.9"
 types-pywin32==308.0.0.20241221; python_version<"3.9"
 types-PyYAML==6.0.12.20250915