Remove usage of deprecated set-output

Signed-off-by: Matthias Wahl <matthiaswahl@m7w3.de>

Author: mfelsche

.github/workflows/draft-new-release.yaml

@@ -60,7 +60,7 @@ jobs:
         run: |
 
           git commit -sa -m "Prepare release ${{ env.NEW }}"
-          echo "::set-output name=commit::$(git rev-parse HEAD)"
+          echo "commit=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
       - name: Push new branch
         run: git push origin release/${{ env.NEW }}