chore(deps-dev): bump coverage from 7.3.2 to 7.3.3 in /requirements

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.3.2 to 7.3.3.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.3.2...7.3.3)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

requirements/dev.txt

@@ -1,5 +1,5 @@
 coverage==7.2.7; python_version < '3.8'
-coverage==7.3.2; python_version >= '3.8'
+coverage==7.3.3; python_version >= '3.8'
 flake8==3.3.0; python_version < '3.8'
 flake8==3.8.4; python_version >= '3.8'
 pytest-cov==4.1.0