fix(loadtest): sort imports in pool_check.py

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: yoon-park-rl

loadtest/pool_check.py

@@ -15,8 +15,8 @@
 from __future__ import annotations
 
 import os
-import resource
 import sys
+import resource
 
 from runloop_api_client import Runloop