feat(container): update image ghcr.io/cloudnative-pg/postgresql to v16.4-2

[layla-bot]

This PR contains the following updates:

Package	Update	Change
ghcr.io/cloudnative-pg/postgresql	minor	16.3-10 -> 16.4-2

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[layla-bot]

--- kubernetes/main/apps/database/cloudnative-pg/cluster Kustomization: flux-system/cloudnative-pg-cluster Cluster: database/postgres

+++ kubernetes/main/apps/database/cloudnative-pg/cluster Kustomization: flux-system/cloudnative-pg-cluster Cluster: database/postgres

@@ -45,13 +45,13 @@

           name: cloudnative-pg-secret
       serverName: postgres-v20
       wal:
         compression: bzip2
         maxParallel: 8
     name: postgres-v20
-  imageName: ghcr.io/cloudnative-pg/postgresql:16.3-10
+  imageName: ghcr.io/cloudnative-pg/postgresql:16.4-2
   instances: 1
   monitoring:
     enablePodMonitor: true
   postgresql:
     parameters:
       max_connections: '600'