Bump pytest-cov from 4.1.0 to 5.0.0 in /requirements

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 4.1.0 to 5.0.0.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v4.1.0...v5.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements/testing.txt

@@ -3,6 +3,6 @@ flaky==3.7.0
 hypothesis==6.97.0
 pytest==8.0.1
 pytest-benchmark==4.0.0
-pytest-cov==4.1.0
+pytest-cov==5.0.0
 pytest-datadir==1.5.0
 pytest-xdist==3.5.0