Update docker.io/postgres Docker tag to v18

clusters/cl01tl/platform/stalwart/values.yaml

@@ -9,7 +9,7 @@ stalwart:
         main:
           image:
             repository: stalwartlabs/stalwart
-            tag: v0.14.0
+            tag: v0.13.4
             pullPolicy: IfNotPresent
           resources:
             requests:

hosts/ps10rp/gitea/compose.yaml

@@ -19,7 +19,7 @@ services:
             - /dev/net/tun:/dev/net/tun
 
     postgresql:
-        image: docker.io/postgres:17.6-alpine3.21
+        image: docker.io/postgres:18.0-alpine3.21
         container_name: gitea-postgres
         env_file:
             - .env