Update Postgres images to 14.12

This is done to match the production version
which is used on AWS RDS, according to the most
recent maintenance by OPS in ticket OPS-10475.

This API depends on v3 API to start the database,
thus integrated compose file is used, instead of
standalone `compose.yaml` file in root of the repo.
Even though this file isn't usually used,
update Postgres version to keep them in sync.

compose.yaml

@@ -24,7 +24,7 @@ services:
     depends_on:
       - db
   db:
-    image: postgres:14.8-alpine3.18
+    image: postgres:14.12-alpine3.19
     environment:
       - POSTGRES_PASSWORD=demo
       - POSTGRES_USER=demo

tests/compose.yaml

@@ -1,6 +1,6 @@
 services:
   db:
-    image: postgres:14.8-alpine3.18
+    image: postgres:14.12-alpine3.19
     ports:
       - 6432:5432
     environment: