chore: specifiy stac-fastapi-pgstac version

Author: alukach

docker-compose.yaml

@@ -14,7 +14,7 @@ services:
     volumes:
       - ./.pgdata:/var/lib/postgresql/data
   stac:
-    image: ghcr.io/stac-utils/stac-fastapi-pgstac
+    image: ghcr.io/stac-utils/stac-fastapi-pgstac:5.0.0
     environment:
       APP_HOST: 0.0.0.0
       APP_PORT: 8001