Use Postgres 15 for tests as we use it everywhere else...

Author: trasch

docker-compose.yml

@@ -10,6 +10,6 @@ x-shared-config: &shared_config
     - 5432:5432
 
 services:
-  psql-14:
-    image: postgres:14
+  psql-15:
+    image: postgres:15
     <<: *shared_config