Bump coverage from 7.6.4 to 7.6.8 (#2547)

Bumps [coverage](https://github.com/nedbat/coveragepy) 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:development
  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>

requirements-dev.txt

@@ -1,3 +1,3 @@
-coverage==7.6.4
+coverage==7.6.8
 mock==5.1.0
 responses==0.25.3