Bump peter-evans/create-pull-request from 6 to 7

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 6 to 7.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v6...v7)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/add_release_documentation.yml

@@ -146,7 +146,7 @@ jobs:
         ./generate_redirections.sh $GITHUB_REF_NAME
     - name: Create Pull Request at DLR-AMR/t8code-website
       if: ${{ env.MINOR_RELEASE == 'true' }}
-      uses: peter-evans/create-pull-request@v6
+      uses: peter-evans/create-pull-request@v7
       with:
         path: t8code-website
         title: Add documentation for t8code ${{ github.ref_name }}