Bump coverage from 7.3.2 to 7.4.0

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.3.2 to 7.4.0.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.3.2...7.4.0)

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

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

tests/requirements.txt

@@ -1,4 +1,4 @@
-coverage==7.3.2
+coverage==7.4.0
 pytest==7.4.4
 pytest-cov==4.1.0
 lightning>=1.8.4