Drop to PG 12 for old Ubuntu image

foreman-module.yaml

@@ -40,7 +40,7 @@ test:
           - 'ruby:3.0'
           - 'ruby:3.1'
         POSTGRES_VERSION:
-          - 15
+          - 12
 
   services:
     - name: docker.io/library/postgres:$POSTGRES_VERSION-alpine