fix(container): update image ghcr.io/cloudnative-pg/postgresql to v16.4-48

Author: layla-bot[bot]

kubernetes/main/apps/database/cloudnative-pg/cluster/cluster.yaml

@@ -7,7 +7,7 @@ metadata:
   namespace: database
 spec:
   instances: 1
-  imageName: ghcr.io/cloudnative-pg/postgresql:16.4-47
+  imageName: ghcr.io/cloudnative-pg/postgresql:16.4-48
   primaryUpdateStrategy: unsupervised
   storage:
     size: 20Gi