Bump docker/build-push-action from 6.3.0 to 6.4.0 (#337)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -97,7 +97,7 @@ jobs:
             description="The NGINX Ingress Operator is a Kubernetes/OpenShift component which deploys and manages one or more NGINX/NGINX Plus Ingress Controllers"
 
       - name: Build Image
-        uses: docker/build-push-action@1a162644f9a7e87d8f4b053101d1d9a712edc18c # v6.3.0
+        uses: docker/build-push-action@a254f8ca60a858f3136a2f1f23a60969f2c402dd # v6.4.0
         with:
           context: "."
           cache-from: type=gha