Bump coverage from 7.8.0 to 7.11.0 in /requirements

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.8.0 to 7.11.0.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](coveragepy/coveragepy@7.8.0...7.11.0)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.11.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]