Update docker/build-push-action action to v7

Author: renovate[bot]

.github/workflows/ci.yml

@@ -89,7 +89,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: ${{ matrix.image }}
           load: true