chore(deps-dev): update coverage requirement from 7.4.1 to 7.4.3 (#79)

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@7.4.1...7.4.3)

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

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pyproject.toml

@@ -47,7 +47,7 @@ defusedxml = "^0.7.1"
 
 [tool.poetry.dev-dependencies]
 tox = "4.11.4"
-coverage = "7.4.1"
+coverage = "7.4.3"
 xmldiff = "2.6.3"
 mypy =  "1.8.0"
 autopep8 = "2.0.4"