fix(container): update image ghcr.io/cloudnative-pg/postgresql to v16.4-20

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/cloudnative-pg/postgresql	patch	16.4-19 -> 16.4-20

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[github-actions]

--- kubernetes/apps/database/cloudnative-pg/cluster Kustomization: flux-system/cloudnative-pg-cluster Cluster: database/postgres16

+++ kubernetes/apps/database/cloudnative-pg/cluster Kustomization: flux-system/cloudnative-pg-cluster Cluster: database/postgres16

@@ -7,13 +7,13 @@

     kustomize.toolkit.fluxcd.io/name: cloudnative-pg-cluster
     kustomize.toolkit.fluxcd.io/namespace: flux-system
   name: postgres16
   namespace: database
 spec:
   enableSuperuserAccess: true
-  imageName: ghcr.io/cloudnative-pg/postgresql:16.4-19
+  imageName: ghcr.io/cloudnative-pg/postgresql:16.4-20
   instances: 1
   monitoring:
     enablePodMonitor: true
   postgresql:
     parameters:
       max_connections: '600'
--- kubernetes/apps/database/cloudnative-pg/linkwarden-cluster Kustomization: flux-system/cloudnative-pg-cluster-linkwarden Cluster: database/linkwarden

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

@@ -7,13 +7,13 @@

     kustomize.toolkit.fluxcd.io/name: cloudnative-pg-cluster-linkwarden
     kustomize.toolkit.fluxcd.io/namespace: flux-system
   name: linkwarden
   namespace: database
 spec:
   enableSuperuserAccess: true
-  imageName: ghcr.io/cloudnative-pg/postgresql:16.4-19
+  imageName: ghcr.io/cloudnative-pg/postgresql:16.4-20
   instances: 1
   monitoring:
     enablePodMonitor: true
   postgresql:
     parameters:
       max_connections: '600'