Fix the kustomize version

Author: saikat-royc

deploy/kubernetes/install-kustomize.sh

@@ -50,7 +50,7 @@ curl -s https://api.github.com/repos/kubernetes-sigs/kustomize/releases |\
   grep browser_download |\
   grep $opsys |\
   cut -d '"' -f 4 |\
-  grep /kustomize/v3.8.6 |\
+  grep /kustomize/v3.9.4 |\
   sort | tail -n 1 |\
   xargs curl -s -O -L