Update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/docker-image-build.yml

@@ -36,7 +36,7 @@ jobs:
           echo "TAG=$(echo ${{ github.event.release.tag_name }} | sed 's/^v//')" >> $GITHUB_ENV
 
       - name: 🏗 Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           provenance: false