promote CSINodeExpandSecret feature to Beta

This commit flip the feature gate of `CSINodeExpandSecret` to Beta
and default ON.
Reference:
kubernetes/enhancements#3107
kubernetes/enhancements#3531

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

pkg/features/kube_features.go

@@ -167,6 +167,7 @@ const (
 	// owner: @humblec, @zhucan
 	// kep: http://kep.k8s.io/3171
 	// alpha: v1.25
+	// beta: v1.27
 	//
 	// Enables SecretRef field in CSI NodeExpandVolume request.
 	CSINodeExpandSecret featuregate.Feature = "CSINodeExpandSecret"
@@ -837,7 +838,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 
 	CSIMigrationvSphere: {Default: true, PreRelease: featuregate.Beta},
 
-	CSINodeExpandSecret: {Default: false, PreRelease: featuregate.Alpha},
+	CSINodeExpandSecret: {Default: true, PreRelease: featuregate.Beta},
 
 	CSIStorageCapacity: {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.26