Update kubekins-e2e image version to v9-go1.23.4 (#6448)

Author: fgksgf

ci/pull_e2e_kind_v2.groovy

@@ -32,7 +32,7 @@ metadata:
 spec:
   containers:
   - name: main
-    image: hub.pingcap.net/tidb-operator/kubekins-e2e:v9-go1.23.12
+    image: hub.pingcap.net/tidb-operator/kubekins-e2e:v9-go1.23.4
     command:
     - runner.sh
     - exec