github-actions(deps): bump gr2m/create-or-update-pull-request-action

Bumps [gr2m/create-or-update-pull-request-action](https://github.com/gr2m/create-or-update-pull-request-action) from 1.4.1 to 1.5.1.
- [Release notes](https://github.com/gr2m/create-or-update-pull-request-action/releases)
- [Commits](gr2m/create-or-update-pull-request-action@v1.4.1...v1.5.1)

---
updated-dependencies:
- dependency-name: gr2m/create-or-update-pull-request-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/update.yaml

@@ -37,7 +37,7 @@ jobs:
         run: "php bin/laxify-schema.php"
 
       - name: "Open pull request updating schema"
-        uses: "gr2m/create-or-update-pull-request-action@v1.4.1"
+        uses: "gr2m/create-or-update-pull-request-action@v1.5.1"
         with:
           author: "ergebnis-bot <[email protected]>"
           branch: "feature/schema"