Fast-forward cookiecutter

[Zeitsperre]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes Add boilerplate #1
• (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 versions of actions and linting tools via the cookiecutter
• Fixed some action permissions and targets
• Added authors to AUTHORS.rst and .zenodo.json
• Updated the Contributor Covenant to version 2.1

Does this PR introduce a breaking change?

No.

Discussion

I still need to set token permissions for the repository before most actions will work properly. Moving onto this now.

[github-actions]

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[Zeitsperre]

@RondeauG There are two more things I want to modify before going forward. Should be ready very soon.