chore(deps-dev): update typing-extensions requirement (#41)

Updates the requirements on [typing-extensions](https://github.com/python/typing_extensions) to permit the latest version.
- [Release notes](https://github.com/python/typing_extensions/releases)
- [Changelog](https://github.com/python/typing_extensions/blob/main/CHANGELOG.md)
- [Commits](python/typing_extensions@4.5.0...4.7.1)

---
updated-dependencies:
- dependency-name: typing-extensions
  dependency-type: direct:development
...

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

pyproject.toml

@@ -49,7 +49,7 @@ flake8-isort = "4.2.0"
 isort = "5.11.5" # last version supporting Python 3.7
 mypy = "1.4.1"
 tox = "3.28.0"
-typing-extensions = {version = "4.5.0", python = "<3.8"}
+typing-extensions = {version = "4.7.1", python = "<3.8"}
 xmldiff = "2.6.3"
 
 [build-system]