⬆️ Update image ghcr.io/cloudnative-pg/postgresql to v15.5-6

[feisar-bot]

This PR contains the following updates:

Package	Update	Change
ghcr.io/cloudnative-pg/postgresql	patch	15.5-5 -> 15.5-6

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[feisar-bot]

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

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

@@ -22,13 +22,13 @@

       serverName: postgres-v8
       wal:
         compression: bzip2
         maxParallel: 8
     retentionPolicy: 7d
   enableSuperuserAccess: true
-  imageName: ghcr.io/cloudnative-pg/postgresql:15.5-5
+  imageName: ghcr.io/cloudnative-pg/postgresql:15.5-6
   instances: 3
   monitoring:
     enablePodMonitor: true
   primaryUpdateStrategy: unsupervised
   storage:
     size: 50Gi