Bump coverage from 7.2.7 to 7.3.0 (#849)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.2.7 to 7.3.0.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](coveragepy/coveragepy@7.2.7...7.3.0)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

test-requirements.txt

@@ -7,4 +7,4 @@ Werkzeug==1.0.1
 Flask-Testing==0.8.1
 blinker==1.6.2
 nose2-cov==1.0a4
-coverage==7.2.7
+coverage==7.3.0