🎨 Renovate: Update docker.io/postgres Docker tag to v18.4

[SpiritLooper]

This PR contains the following updates:

Package	Update	Change
docker.io/postgres	minor	18.3 → 18.4

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This PR has been generated by Mend Renovate.

[github-actions]

Here is the diff to main:

--- k8s/apps/services Kustomization: flux-system/services HelmRelease: services/romm-pg

+++ k8s/apps/services Kustomization: flux-system/services HelmRelease: services/romm-pg

@@ -19,7 +19,7 @@

     image:
       registry: docker.io
       repository: postgres
-      tag: '18.3'
+      tag: '18.4'
     persistence:
       annotations:
         k8up.io/backup: 'false'
--- HelmRelease: services/romm-pg StatefulSet: services/romm-pg-postgres

+++ HelmRelease: services/romm-pg StatefulSet: services/romm-pg-postgres

@@ -50,7 +50,7 @@

           runAsGroup: 999
           runAsNonRoot: true
           runAsUser: 999
-        image: docker.io/postgres:18.3
+        image: docker.io/postgres:18.4
         imagePullPolicy: Always
         args:
         - postgres