correct syntax error for sleep command to wait for port-forwading to …

…be ongoing

.github/workflows/lint-test.yaml

@@ -68,7 +68,7 @@ jobs:
       - name: curl test
         run: |
           kubectl -n ns-vllm port-forward service/test-vllm-service 8001:80 &
-          sleep(10)
+          sleep 10
           CODE=`curl --location http://localhost:8001/v1/completions \
                   --header "Content-Type: application/json" \
                   --data '{