Bump coverage from 6.4 to 6.4.1 (#3666)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 6.4 to 6.4.1.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](https://github.com/nedbat/coveragepy/compare/6.4...6.4.1)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements_tests.txt

@@ -1,6 +1,6 @@
 black==22.3.0
 codecov==2.1.12
-coverage==6.4
+coverage==6.4.1
 flake8-docstrings==1.6.0
 flake8==4.0.1
 pre-commit==2.19.0