Update pytest-cov requirement from ~=4.0 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@v4.0.0...v6.0.0)

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

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

pyproject.toml

@@ -62,7 +62,7 @@ tests = [
     "flake8~=7.0",
     "pylint~=3.1",
     "pytest~=8.0",
-    "pytest-cov~=4.0",
+    "pytest-cov~=6.0",
 ]
 
 [build-system]