CI: (deps): Bump coverage from 7.4.1 to 7.4.2 in /ci

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.4.1 to 7.4.2.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.4.1...7.4.2)

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

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

ci/test_requirements.txt

@@ -2,4 +2,4 @@ packaging==23.2
 pytest==8.0.1
 pytest-mpl==0.17.0
 netCDF4==1.6.5
-coverage==7.4.1
+coverage==7.4.2