fix(container): update image ghcr.io/cloudnative-pg/postgresql to v16.1-12 (#3866)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ghcr.io/cloudnative-pg/postgresql | patch | `16.1-9` -> `16.1-12` |

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kubernetes/kyak/apps/database/cloudnative-pg/cluster/cluster16.yaml

@@ -6,7 +6,7 @@ metadata:
   name: postgres16
 spec:
   instances: 3
-  imageName: ghcr.io/cloudnative-pg/postgresql:16.1-9
+  imageName: ghcr.io/cloudnative-pg/postgresql:16.1-12
   primaryUpdateStrategy: unsupervised
   storage:
     size: 20Gi