refactor: Fixated Postgres Version to 15.1

All Minor Updates will cause a crashing postgres on start

ccp/modules/id-management-compose.yml

@@ -41,7 +41,7 @@ services:
       - patientlist-db
 
   patientlist-db:
-    image: postgres:14-alpine
+    image: postgres:15.1-alpine
     container_name: bridgehead-patientlist-db
     environment:
       POSTGRES_USER: "mainzelliste"