fix(helm): update authentik

| datasource | package   | from     | to       |
| ---------- | --------- | -------- | -------- |
| helm       | authentik | 2026.5.2 | 2026.5.3 |

Author: renovate[bot]

kubernetes/subterra/apps/infra/authentik/app/helmrelease.yaml

@@ -11,7 +11,7 @@ spec:
     spec:
       # renovate: registryUrl=https://charts.goauthentik.io
       chart: authentik
-      version: 2026.5.2
+      version: 2026.5.3
       sourceRef:
         kind: HelmRepository
         name: authentik-charts