chore(deps): update postgres docker tag to v18

Author: renovate[bot]

.github/workflows/tests.yml

@@ -128,7 +128,7 @@ jobs:
         otp: ["24.1"]
     services:
       db:
-        image: postgres:13-alpine
+        image: postgres:18-alpine
         ports: ["5432:5432"]
         env:
           POSTGRES_PASSWORD: postgres

docker-compose.yml

@@ -2,7 +2,7 @@ version: '2'
 
 services:
   postgres:
-    image: postgres:14.1
+    image: postgres:18.1
     volumes:
       - ./postgresql-data:/var/lib/postgresql/data/pgdata
     environment: