Set the sample nakama version to v1.2.3 (#45)

Update the sample nakama version in starter-game-template to v1.2.3.

[Link to the active Nakama
versions](https://github.com/Argus-Labs/world-engine/pkgs/container/world-engine-nakama)

docker-compose.yml

@@ -82,7 +82,7 @@ services:
 
   nakama:
     platform: linux/amd64
-    image: us-docker.pkg.dev/argus-labs/world-engine/relay/nakama@sha256:8c7344643e4d993b105e2d0f151787df0533cc9ca85c4b5f67bb01bd3748341f
+    image: us-docker.pkg.dev/argus-labs/world-engine/relay/nakama:v1.2.3
     container_name: nakama
     depends_on:
       nakama-db: