Bump stefanzweifel/git-auto-commit-action from 5 to 6

Bumps [stefanzweifel/git-auto-commit-action](https://github.com/stefanzweifel/git-auto-commit-action) from 5 to 6.
- [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@v5...v6)

---
updated-dependencies:
- dependency-name: stefanzweifel/git-auto-commit-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/book.yml

@@ -33,7 +33,7 @@ jobs:
         echo "Generated book for: ${{ matrix.language }}" >> $GITHUB_STEP_SUMMARY
 
     - name: Commit updated toc.md for the book
-      uses: stefanzweifel/git-auto-commit-action@v5
+      uses: stefanzweifel/git-auto-commit-action@v6
       with:
         commit_message: Writing updated toc.md for the ${{ matrix.language }} book
         branch: ${{ github.head_ref }}

.github/workflows/generate-mindmap.yml

@@ -54,6 +54,6 @@ jobs:
     - name: Reduce Screenshot Size (PNG)
       run: npx optipng ${{ matrix.folder }}/innersource-program-mind-map.png
     - name: Commit Changes
-      uses: stefanzweifel/git-auto-commit-action@v5
+      uses: stefanzweifel/git-auto-commit-action@v6
       with:
         commit_message: Re-creating markmap and screenshot