chore(deps): update postgres docker tag to v18

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -34,7 +34,7 @@ jobs:
   go-test:
     services:
       postgres:
-        image: postgres:15
+        image: postgres:18
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres
@@ -51,7 +51,7 @@ jobs:
   go-generate:
     services:
       postgres:
-        image: postgres:15
+        image: postgres:18
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres
@@ -70,7 +70,7 @@ jobs:
   go-fmt:
     services:
       postgres:
-        image: postgres:15
+        image: postgres:18
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres
@@ -88,7 +88,7 @@ jobs:
   go-build-test:
     services:
       postgres:
-        image: postgres:15
+        image: postgres:18
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres