ci: pin selenium docker image tag 1.0.0

scripts/ui-tests/docker-compose.yaml

@@ -8,7 +8,7 @@ services:
 
   selenium:
     shm_size: '2gb'
-    image: ghcr.io/emqx/selenium-chrome:latest
+    image: ghcr.io/emqx/selenium-chrome:1.0.0
     volumes:
       - ./:/app
     depends_on: