Update docker/build-push-action action to v6 (#350)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/dockerPush.yml

@@ -35,7 +35,7 @@ jobs:
           images: ree6/backend
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5.4.0
+        uses: docker/build-push-action@v6.7.0
         with:
           context: Backend/
           push: true
@@ -69,7 +69,7 @@ jobs:
           images: ree6/frontend
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5.4.0
+        uses: docker/build-push-action@v6.7.0
         with:
           platforms: linux/amd64,linux/arm64
           context: Frontend/docker