Bump coverage from 7.6.8 to 7.6.9 in /requirements

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.6.8 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@7.6.8...7.6.9)

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

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

Author: dependabot[bot]

requirements/tests.txt

@@ -1,4 +1,4 @@
 -r dev.txt
-coverage==7.6.8
+coverage==7.6.9
 requests-mock==1.12.1
 tox<5.0.0