[Dependabot]: Update pytest-cov requirement from ~=5.0 to ~=6.0

Updates the requirements on [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

tests/requirements.txt

@@ -5,7 +5,7 @@ Coverage ~= 7.6
 
 # Test Runner
 pytest ~= 8.3
-pytest-cov ~= 5.0
+pytest-cov ~= 6.0
 
 # Static Type Checking
 mypy ~= 1.13