poetry(deps-dev): bump coverage from 6.1.1 to 6.1.2

Bumps [coverage](https://github.com/nedbat/coveragepy) from 6.1.1 to 6.1.2.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@6.1.1...6.1.2)

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

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