images optimization (#1478)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.github/workflows/calibreapp-image-actions.yml

@@ -21,6 +21,6 @@ jobs:
           persist-credentials: false
 
       - name: Compress Images
-        uses: calibreapp/image-actions@1.1.0
+        uses: calibreapp/image-actions@main
         with:
           githubToken: ${{ secrets.GITHUB_TOKEN }}