Bump coverage from 6.4.1 to 6.4.2 (#306)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 6.4.1 to 6.4.2.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@6.4.1...6.4.2)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
(cherry picked from commit c3d434f)

Author: dependabot[bot]

requirements/requirements_test.txt

@@ -5,4 +5,4 @@ matplotlib==3.5.2
 vtk==9.0.3
 pyvista==0.35.1
 ansys-platform-instancemanagement==1.0.2
-coverage==6.4.1
+coverage==6.4.2