Bump pytest-cov from 5.0.0 to 6.0.0 (#704)

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 5.0.0 to 6.0.0.
- [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
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Henrik Skupin <[email protected]>

requirements/tests.txt

@@ -1,5 +1,5 @@
 coveralls[yaml]==4.0.1
 pytest==8.3.3
-pytest-cov==5.0.0
+pytest-cov==6.0.0
 pytest-mock==3.14.0
 wptserve==4.0.2