build(deps): bump coverage from 7.6.7 to 7.6.8

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.6.7 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@7.6.7...7.6.8)

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

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

test_reqs.txt

@@ -9,7 +9,7 @@ python-dateutil==2.9.0.post0
 text-unidecode==1.3  # for faker
 faker==33.0.0
 factory-boy==3.3.1
-coverage==7.6.7
+coverage==7.6.8
 mccabe==0.7.0
 pycodestyle==2.12.1
 flake8==7.1.1