Keep GitHub Actions up to date with GitHub's Dependabot

[cclauss]

Short description

Keep GitHub Actions up to date with GitHub's Dependabot

Proposed changes

• https://docs.github.com/en/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-dependabot
• https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#package-ecosystem

Also, % black . # to format files for black stable style 2024. This adds one blank line to nine Python files. 😃

Resolved issues

Fixes: The warnings at the bottom right of:

• https://github.com/sphinx-doc/sphinxcontrib-django/actions/runs/8039199482

@timobrembeck Your review, please.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (f4dfbbd) to head (d89bf69).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #64 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 10 10 Lines 328 328 ========================================= Hits 328 328 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[cclauss]

Generated:

• 67