build(deps-dev): update pytest-cov requirement from ==4.1.0 to ==6.0.0

Updates the requirements on [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v4.1.0...v6.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -105,7 +105,7 @@ pylint = "==3.3.1"
 flake8 = "==5.0.4"
 parameterized = "==0.9.0"
 pytest = "==7.4.4"
-pytest-cov = "==4.1.0"
+pytest-cov = "==6.0.0"
 pytest-watcher = "==0.4.3"
 grpcio-tools = "==1.60.0"
 mypy-protobuf = "==3.2.0"