Update coverage requirement from >=7.14.1 to >=7.15.0

Updates the requirements on [coverage](https://github.com/coveragepy/coveragepy) to permit the latest version.
- [Release notes](https://github.com/coveragepy/coveragepy/releases)
- [Changelog](https://github.com/coveragepy/coveragepy/blob/main/CHANGES.rst)
- [Commits](https://github.com/coveragepy/coveragepy/compare/7.14.1...7.15.0)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.15.0
  dependency-type: direct:production
...

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