Bump coverage from 7.6.10 to 7.6.12

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.6.10 to 7.6.12.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](https://github.com/nedbat/coveragepy/compare/7.6.10...7.6.12)

Changelog: chore