Update coverage requirement from ^6.4 to ^7.1 (#466)

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/6.4...7.1.0)

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

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pyproject.toml

@@ -54,7 +54,7 @@ black = "^22.10"
 isort = "^5.9.3"
 flake8 = "^5.0.4"
 bandit = "^1.7.4"
-coverage = "^6.4"
+coverage = "^7.1"
 pytest-cov = "^4.0.0"
 pytest-xdist = "^3.1.0"
 unasync = "^0.5.0"