Update pytest-cov requirement from ~=5.0 to ~=6.0 (#10067)

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@v5.0.0...v6.0.0)

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

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requirements_test.txt

@@ -2,7 +2,7 @@
 coverage~=7.6
 tbump~=6.11.0
 contributors-txt>=1.0.0
-pytest-cov~=5.0
+pytest-cov~=6.0
 pytest-xdist~=3.6
 six
 # Type packages for mypy