build(deps): update coverage requirement from ~=7.2.2 to ~=7.6.10

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@7.2.2...7.6.10)

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

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

test-requirements.txt

@@ -1,3 +1,3 @@
 pytest~=7.2.2
-coverage~=7.2.2
+coverage~=7.6.10
 testfixtures~=8.2.0