⬆ Update coverage requirement from ^6.2 to >=6.2,<8.0 (#663)

⬆ Update coverage requirement from ^6.2 to >=6.2,<8.0 (#663)

Updates the requirements on [coverage](https://github.com/nedbat/coveragepy) to permit the latest version.
- [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/6.2...7.2.7)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:development
...

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