🔧(compose) stop forcing platform for Keycloak PostgreSQL image

Forcing `platform: linux/amd64` for the PostgreSQL
image causes compatibility issues and performance
degradation on Mac ARM chips (M1/M2).
Removing the platform specification allows Docker
to select the appropriate architecture automatically,
ensuring better performance and compatibility.

docker-compose.yml

@@ -172,7 +172,6 @@ services:
 
   kc_postgresql:
     image: postgres:14.3
-    platform: linux/amd64
     ports:
       - "5433:5432"
     env_file: