chore(deps): update dependency pytest-cov to v6

Author: renovate[bot]

requirements-dev.txt

@@ -4,6 +4,6 @@ flake8-quotes==3.4.0
 mypy==1.14.1
 pre-commit==4.0.1
 pytest==8.3.4
-pytest-cov==5.0.0
+pytest-cov==6.0.0
 python-powerdns==2.1.0
 requests==2.32.3