Bump stefanzweifel/git-auto-commit-action from 6 to 7

Bumps [stefanzweifel/git-auto-commit-action](https://github.com/stefanzweifel/git-auto-commit-action) from 6 to 7.
- [Release notes](https://github.com/stefanzweifel/git-auto-commit-action/releases)
- [Changelog](https://github.com/stefanzweifel/git-auto-commit-action/blob/master/CHANGELOG.md)
- [Commits](stefanzweifel/git-auto-commit-action@v6...v7)

---
updated-dependencies:
- dependency-name: stefanzweifel/git-auto-commit-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/black-fix.yml

@@ -30,6 +30,6 @@ jobs:
       run: |
         $HOME/.local/bin/black . $(grep '^#!.*/bin/.*python.*$' . -Ir|cut -d: -f1)
 
-    - uses: stefanzweifel/git-auto-commit-action@v6
+    - uses: stefanzweifel/git-auto-commit-action@v7
       with:
         commit_message: "Apply black changes"