fix: skip commit/push in update_version when tag is unchanged

git commit was failing the step (and job) with "nothing to commit" when
the target tag already matched releases/versions.yaml, e.g. on a re-run
for the same commit SHA.

infra/update_version/action.yml

@@ -38,5 +38,9 @@ runs:
         git config user.email "gitea-actions@gitea.pixelparasol.com"
         git config user.name "Gitea Actions"
         git add releases/versions.yaml
+        if git diff --cached --quiet; then
+          echo "No version change for ${{ inputs.service }}, skipping commit"
+          exit 0
+        fi
         git commit -m "chore: update ${{ inputs.service }} to ${{ inputs.tag }}"
         git push