Fix error in "fixed" timestamps

sia/web_agent.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import Enum, auto
 from threading import Lock
 from typing import Callable, Dict, List, Optional
@@ -154,7 +154,7 @@ class WebAgent(BaseAgent):
         if llm_name not in self._llms:
             raise ValueError(f"Unknown LLM: {llm_name}")
 
-        timestamp = datetime.now(datetime.timezone.utc)
+        timestamp = datetime.now(timezone.utc)
         self._iteration_logger.log_iteration(timestamp, self._context, response)
         parse_result = self._parser.parse(timestamp, response)
         if isinstance(parse_result, Command):