Update postgres Docker tag to v18

postiz/compose.yaml

@@ -109,7 +109,7 @@ services:
         condition: service_healthy
 
   postiz-postgres:
-    image: postgres:17-alpine
+    image: postgres:18-alpine
     container_name: postiz-postgres
     restart: always
     network_mode: bridge

teslamate/compose.yaml

@@ -29,7 +29,7 @@ services:
 
   postgresql17:
     container_name: "postgresql17"
-    image: postgres:17-alpine3.22
+    image: postgres:18-alpine3.22
     restart: always
     network_mode: "bridge"
     ports: