Update postgres Docker tag to v18

Author: renovate[bot]

.github/workflows/ci.yml

@@ -76,7 +76,7 @@ jobs:
       RAILS_ENV: test
     services:
       postgres:
-        image: postgres:17
+        image: postgres:18
         env:
           POSTGRES_PASSWORD: postgres
         options: >-

docker-compose.load_production_database.yml

@@ -10,7 +10,7 @@ x-link-database: &link-database
 
 services:
   load_production_database:
-    image: postgres:17
+    image: postgres:18
     links:
       - postgres
     depends_on:

docker-compose.test.yml

@@ -10,7 +10,7 @@ services:
       DEVELOPMENT_DATABASE_URL: postgresql://postgres:postgres@postgres/intercode_development
       TEST_DATABASE_URL: postgresql://postgres:postgres@postgres/intercode_test
   postgres:
-    image: postgres:17
+    image: postgres:18
     expose:
       - '5432'
     environment:

docker-compose.yml

@@ -39,7 +39,7 @@ services:
       DEVELOPMENT_DATABASE_URL: postgresql://postgres:postgres@postgres/intercode_development
       TEST_DATABASE_URL: postgresql://postgres:postgres@postgres/intercode_test
   postgres:
-    image: postgres:17
+    image: postgres:18
     expose:
       - '5432'
     environment: