chore: sync API

Author: CloudNativePG Automated Updates

pkg/api/v1/cluster_types.go

@@ -1473,7 +1473,7 @@ type PostgresConfiguration struct {
 type ExtensionConfiguration struct {
 	// The name of the extension, required
 	// +kubebuilder:validation:MinLength=1
-	// +kubebuilder:validation:Pattern=`^[a-z0-9]([-a-z0-9]*[a-z0-9])?$`
+	// +kubebuilder:validation:Pattern=`^[a-z0-9]([-a-z0-9_]*[a-z0-9])?$`
 	Name string `json:"name"`
 
 	// The image containing the extension, required