fix: [autogenbench] writing to stdout encoding error in win-os (microsoft#2002)

Author: lalo

samples/tools/autogenbench/autogenbench/run_cmd.py

@@ -500,6 +500,7 @@ def run_scenario_in_docker(work_dir, env, timeout=TASK_TIMEOUT, docker_image=Non
         chunk = chunk.decode("utf-8")
         log_file.write(chunk)
         log_file.flush()
+        sys.stdout.reconfigure(encoding="utf-8")
         sys.stdout.write(chunk)
         sys.stdout.flush()