Update external-secrets documentation to use the stable API version (v1) for ClusterSecretStore and ExternalSecret resources.

Author: akshat5302

self-hosting/govern/external-secrets.mdx

@@ -74,7 +74,7 @@ This guide explains how to integrate Plane with external secret management solut
 
 9. Apply the following YAML to create a ClusterSecretStore resource:
     ```yaml
-    apiVersion: external-secrets.io/v1beta1
+    apiVersion: external-secrets.io/v1
     kind: ClusterSecretStore
     metadata:
       name: cluster-aws-secretsmanager
@@ -144,7 +144,7 @@ Make sure to set all [environment variables](/self-hosting/methods/kubernetes#ex
 
 5. Apply the following YAML to create a ClusterSecretStore resource:
     ```yaml
-    apiVersion: external-secrets.io/v1beta1
+    apiVersion: external-secrets.io/v1
     kind: ClusterSecretStore
     metadata:
       name: vault-backend
@@ -165,7 +165,7 @@ Make sure to set all [environment variables](/self-hosting/methods/kubernetes#ex
 
 6. Create an ExternalSecret resource to fetch secrets from Vault and create a corresponding Kubernetes secret:
     ```yaml
-    apiVersion: external-secrets.io/v1beta1
+    apiVersion: external-secrets.io/v1
     kind: ExternalSecret
     metadata:
       name: rabbitmq-external-secrets