fix: [autogenbench] windows fails unless we specify encoding (#1957)

Author: lalo

samples/tools/autogenbench/autogenbench/run_cmd.py

@@ -492,7 +492,7 @@ def run_scenario_in_docker(work_dir, env, timeout=TASK_TIMEOUT, docker_image=Non
     docker_timeout = timeout + 60  # One full minute after the bash timeout command should have already triggered
     start_time = time.time()
     logs = container.logs(stream=True)
-    log_file = open(os.path.join(work_dir, "console_log.txt"), "wt")
+    log_file = open(os.path.join(work_dir, "console_log.txt"), "wt", encoding="utf-8")
     stopping = False
 
     for chunk in logs:  # When streaming it should return a generator