Update run_state.py

Author: KirobotDev

src/agents/run_state.py

@@ -135,7 +135,7 @@
 _MISSING_CONTEXT_SENTINEL = object()
 
 
-@dataclass(slots=True)
+@dataclass
 class RunState(Generic[TContext, TAgent]):
     """Serializable snapshot of an agent run, including context, usage, and interruptions.