Update Preflight on Region (#3484)

Co-authored-by: Stefan McShane <stefanmcshane@users.noreply.github.com>

dashboard/src/components/GCPProvisionerSettings.tsx

@@ -369,7 +369,7 @@ const GCPProvisionerSettings: React.FC<Props> = (props) => {
       preflightChecks()
     }
 
-  }, [props.selectedClusterVersion, clusterNetworking]);
+  }, [props.selectedClusterVersion, clusterNetworking, region]);
 
   const preflightChecks = async () => {
     setIsLoading(true);