Update mypy requirement from >=1.14.1 to >=1.19.1

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@v1.14.1...v1.19.1)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.19.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements/test.txt

@@ -2,6 +2,6 @@ PyYAML>=3.10
 pytest
 pytest-cov
 coverage
-mypy>=1.14.1
+mypy>=1.19.1
 types-markdown>=3.7.0.20241204
 types-pyyaml>=6.0.12.20241230