chore(deps): update postgres docker tag to v18

services/Authelia/deployment-authelia.yaml

@@ -32,7 +32,7 @@ spec:
         - name: csismb-authelia-conf
           mountPath: /config
       - name: redis
-        image: redis:8-alpine
+        image: redis:7-alpine
         args:
           - redis-server
           - --requirepass

services/Guacamole/deployment-guacamole.yaml

@@ -67,7 +67,7 @@ spec:
           tcpSocket:
             port: 4822
       - name: db
-        image: postgres:16-alpine
+        image: postgres:18-alpine
         securityContext:
           runAsUser: 70
           runAsGroup: 70