Cookiecutter update

[Zeitsperre]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes #xyz
• (If applicable) Documentation has been added / updated (for bug fixes / features).
• (If applicable) Tests have been added.
• CHANGELOG.rst has been updated (with summary of main changes).
  • Link to issue (:issue:number) and pull request (:pull:number) has been added.

What kind of change does this PR introduce?

• Updates the cookiecutter template
• GitHub Actions and Python dependencies have been updated
• New pre-commit hooks for vulture (find dead code) and codespell (spelling errors)
• Removal of several type: ignore statements
• Spelling errors in documentation have been addressed

Does this PR introduce a breaking change?

No.

[coveralls]

coverage: 81.288%. remained the same
when pulling b2aa7e3 on cookiecutter-update
into 07fd419 on master.