The cause PR is [reverted](https://github.com/kubernetes/kubernetes/pull/117194) by v1.26.1.

## Urgent Upgrade Notes 

### (No, really, you MUST read this before you upgrade)

- 'The `IPv6DualStack` feature gate for external cloud providers was removed.
  (The feature became GA in 1.23 and the gate was removed for all other
  components several releases ago.) If you were still manually

- Feature gates that graduated to GA in 1.23 or earlier and were unconditionally enabled have been removed: CSIServiceAccountToken, ConfigurableFSGroupPolicy, EndpointSlice, EndpointSliceNodeName, EndpointSliceProxying, GenericEphemeralVolume, IPv6DualStack, IngressClassNamespacedParams, StorageObjectInUseProtection, TTLAfterFinished, VolumeSubpath, WindowsEndpointSliceProxying. ([#109435](https://github.com/kubernetes/kubernetes/pull/109435), [@pohly](https://github.com/pohly))