Bump coverage from 7.5.1 to 7.6.1 in /misc/requirements

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.5.1 to 7.6.1.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.5.1...7.6.1)

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

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

misc/requirements/requirements_cov.txt

@@ -1,2 +1,2 @@
-coverage==7.5.1
+coverage==7.6.1
 pytest-cov==5.0.0