authentik: align volumeClaimTemplates TypeMeta with SSA-created live object

StatefulSet/authentik-postgres has been eternally OutOfSync since ~Sprint 65
even though 'kubectl diff --server-side --field-manager=argocd-controller'
shows zero real change. The STS was created via ServerSideApply, so the live
object carries apiVersion/kind inside volumeClaimTemplates[]; git omitting
them makes ArgoCD's normalized diff disagree forever. Declare them in git.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/authentik/authentik.yaml

@@ -113,7 +113,12 @@ spec:
             - name: pgdata
               mountPath: /var/lib/postgresql/data
   volumeClaimTemplates:
-    - metadata:
+    # apiVersion/kind included deliberately: this STS was created via ArgoCD ServerSideApply,
+    # so the live object carries PVC TypeMeta inside volumeClaimTemplates; omitting it here
+    # leaves the app eternally OutOfSync even though kubectl SSA dry-run shows no change.
+    - apiVersion: v1
+      kind: PersistentVolumeClaim
+      metadata:
         name: pgdata
       spec:
         storageClassName: longhorn