FIX: Downgrade to docker/build-push-action@v5 to resolve Persistent 429 errors

Author: yatharth230703

.github/workflows/deploy.yml

@@ -104,7 +104,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build and push backend image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v5
         with:
           context: ./backend
           push: true
@@ -192,7 +192,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build and push frontend image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v5
         with:
           context: .
           file: frontend/Dockerfile