chore(deps): Update docker/build-push-action action to v6.16.0

Author: renovate[bot]

.github/workflows/cd-dgraph-nightly.yml

@@ -22,7 +22,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6.15.0
+        uses: docker/build-push-action@v6.16.0
         with:
           push: true
           platforms: linux/amd64,linux/arm64