Bump coveralls from 3.3.1 to 4.0.0 (#395)

Bumps [coveralls](https://github.com/TheKevJames/coveralls-python) from 3.3.1 to 4.0.0.
- [Release notes](https://github.com/TheKevJames/coveralls-python/releases)
- [Changelog](https://github.com/TheKevJames/coveralls-python/blob/master/CHANGELOG.md)
- [Commits](TheKevJames/coveralls-python@3.3.1...4.0.0)

---
updated-dependencies:
- dependency-name: coveralls
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements/testing.txt

@@ -1,6 +1,6 @@
 -r production.txt
 isort==5.13.2
-coveralls==3.3.1
+coveralls==4.0.0
 flake8==7.0.0
 flake8-isort==6.1.1
 pydocstyle==6.3.0