[Dependabot]: Update mypy requirement from ~=1.11 to ~=1.12

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@v1.11...v1.12.0)

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

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

tests/requirements.txt

@@ -8,6 +8,6 @@ pytest ~= 8.3
 pytest-cov ~= 5.0
 
 # Static Type Checking
-mypy ~= 1.11
+mypy ~= 1.12
 typing_extensions ~= 4.12
 lxml ~= 5.3