chore(deps): update postgres docker tag to v18

Author: renovate[bot]

docker-compose-dev.yml

@@ -12,7 +12,7 @@ services:
     restart: unless-stopped
 
   postgres:
-    image: postgres:16
+    image: postgres:18
     restart: unless-stopped
     environment:
       POSTGRES_DB: meshinfo

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   postgres:
-    image: postgres:16
+    image: postgres:18
     restart: unless-stopped
     environment:
       POSTGRES_DB: meshinfo