fix(container): update ghcr.io/cloudnative-pg/postgresql docker tag to v16.4-39

[mchesterbot]

This PR contains the following updates:

Package	Update	Change
ghcr.io/cloudnative-pg/postgresql	patch	16.4-29 -> 16.4-39

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[mchesterbot]

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

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

@@ -40,13 +40,13 @@

           key: s3-secret-access-key
           name: cloudnative-pg-secret
       wal:
         compression: bzip2
         maxParallel: 8
     name: postgres16-v2
-  imageName: ghcr.io/cloudnative-pg/postgresql:16.4-29
+  imageName: ghcr.io/cloudnative-pg/postgresql:16.4-39
   instances: 3
   monitoring:
     enablePodMonitor: true
   postgresql:
     parameters:
       max_connections: '600'