Replace coverage with pytest-cov in testing dependencies

Replace standalone coverage package with pytest-cov for better pytest integration.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: RonnyPfannschmidt

pyproject.toml

@@ -36,7 +36,7 @@ requires-python = ">=3.10"
 dynamic = ["version"]
 [dependency-groups]
 dev = ["pre-commit", "tox", "mypy", "ruff"]
-testing = ["pytest", "pytest-benchmark", "coverage"]
+testing = ["pytest", "pytest-benchmark", "pytest-cov"]
 
 
 [tool.setuptools]