Update mypy requirement from >=1.5 to >=1.14.1

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...v1.14.1)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.14.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

test-requirements.txt

@@ -3,4 +3,4 @@ pytest-cov >= 2.8.1
 tox >= 3.9.0
 flake8 >= 4.0.0
 types-python-dateutil >= 2.8.19.14
-mypy >= 1.5
+mypy >= 1.14.1