Update coverage requirement from ~=7.0 to ~=7.1

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](nedbat/coveragepy@7.0.0...7.1.0)

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

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

requirements_test.txt

@@ -1,6 +1,6 @@
 -r requirements_test_pre_commit.txt
 -r requirements_test_min.txt
-coverage~=7.0
+coverage~=7.1
 pre-commit~=2.21
 tbump~=6.9.0
 contributors-txt>=1.0.0