Bump coverage from 7.6.1 to 7.6.9

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.6.1 to 7.6.9.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.6.1...7.6.9)

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

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

requirements/dev.txt

@@ -1,5 +1,5 @@
 -r common.txt
-coverage==7.6.1
+coverage==7.6.9
 flake8==7.1.1
 pycodestyle==2.12.1
 pyflakes==3.2.0