Revert "Bump peter-evans/create-pull-request from 5 to 6 (#3052)"

This reverts commit b47510ca336511d0da5a7a998d9afd3e8921ac77.

.github/workflows/docs.yml

@@ -36,7 +36,7 @@ jobs:
         run: echo "timestamp=$(date +'%Y-%m-%d %H:%M:%S')" >> $GITHUB_OUTPUT
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v6
+        uses: peter-evans/create-pull-request@v5
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: "Update documentation ${{ steps.timestamp.outputs.timestamp }}"