flowcontrol only became stable in 1_29

Signed-off-by: clux <sszynrae@gmail.com>

kube-core/src/k8s.rs

@@ -31,6 +31,6 @@ pub use k8s_openapi::{
 };
 
 // Names with version gates
-k8s_openapi::k8s_if_ge_1_26! {
+k8s_openapi::k8s_if_ge_1_29! {
     pub use k8s_openapi::api::flowcontrol::v1 as flowcontrolv1;
 }