feat(container): update image ghcr.io/cloudnative-pg/postgresql ( 18.3 ➔ 18.4 )

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/cloudnative-pg/postgresql	minor	18.3-standard-trixie → 18.4-standard-trixie

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--- kubernetes/apps/database/cnpg/pg18vc Kustomization: database/pg18vc Cluster: database/pg18vc

+++ kubernetes/apps/database/cnpg/pg18vc Kustomization: database/pg18vc Cluster: database/pg18vc

@@ -14,13 +14,13 @@

     enablePodAntiAffinity: false
     nodeSelector:
       kubernetes.io/hostname: kantai1
   bootstrap:
     initdb: {}
   enableSuperuserAccess: true
-  imageName: ghcr.io/cloudnative-pg/postgresql:18.3-standard-trixie
+  imageName: ghcr.io/cloudnative-pg/postgresql:18.4-standard-trixie
   instances: 2
   plugins:
   - isWALArchiver: true
     name: barman-cloud.cloudnative-pg.io
     parameters:
       barmanObjectName: pg18vc-local-ceph