fix: tracing import (#191)

## Change Summary

Fix tracing import.

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apps/relay/src/app.ts

@@ -1,4 +1,4 @@
-import tracing from "./tracing";
+import "./tracing";
 import { RelayServer } from "./server";
 import { CHANNEL_TTL, REDIS_URL, RELAY_SERVER_HOST, RELAY_SERVER_PORT } from "./env";