chore(deps): update mypy requirement from ==1.18.* to ==1.19.* (#251)

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.18.1...v1.19.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.19.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: ttblanchard <55503092+ttblanchard@users.noreply.github.com>

Author: dependabot[bot]

requirements-testing.txt

@@ -6,4 +6,4 @@ pytest-xdist == 3.8.*
 types-PyYAML ~= 6.0
 black == 25.*
 ruff == 0.14.*
-mypy == 1.18.*
+mypy == 1.19.*