chore(deps-dev): bump pytest-cov from 5.0.0 to 6.0.0 in /requirements

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:development
  update-type: version-update:semver-major
...

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

requirements/dev.txt

@@ -1,7 +1,7 @@
 coverage==7.6.4; python_version>="3.9"
 coverage==7.6.1; python_version<"3.9"
 flake8==3.8.4
-pytest-cov==5.0.0
+pytest-cov==6.0.0
 
 # Test requirements
 pytest>=6.1.1