Build(deps): Bump coverage from 7.6.4 to 7.6.8 in the pip-version group (#851)

Bumps the pip-version group with 1 update: [coverage](https://github.com/nedbat/coveragepy).


Updates `coverage` from 7.6.4 to 7.6.8
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.6.4...7.6.8)

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

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

Author: dependabot[bot]

requirements/requirements-test.txt

@@ -1,5 +1,5 @@
 click==8.1.7
-coverage==7.6.4
+coverage==7.6.8
 GitPython==3.1.43
 pytest-cov==5.0.0
 pytest==8.3.3