fix: ci sleep command syntax for macOS 12 (#7203)

Signed-off-by: Mathew Wicks <thesuperzapper@users.noreply.github.com>

hack/port-forward.sh

@@ -9,7 +9,7 @@ pf() {
   ./hack/free-port.sh $port
   echo "port-forward $resource $port"
   kubectl -n argo port-forward "svc/$resource" "$port:$dest_port" > /dev/null &
-	until lsof -i ":$port" > /dev/null ; do sleep 1s ; done
+	until lsof -i ":$port" > /dev/null ; do sleep 1 ; done
 }
 
 wait-for() {