Fix lint errors and update branch

Resolved all CI linting errors in lifecycle.py to comply with project style guidelines and unblock the failing lint check in CI.

Author: Abbas-Asad

src/agents/lifecycle.py

@@ -17,8 +17,8 @@ class RunHooksBase(Generic[TContext, TAgent]):
 
     async def on_agent_start(self, context: RunContextWrapper[TContext], agent: TAgent) -> None:
         """Called before the agent is invoked. Called each time the current agent changes."""
-        pass    
-    
+        pass
+
     async def on_llm_start(
         self,
         context: RunContextWrapper[TContext],
@@ -105,7 +105,7 @@ async def on_llm_end(
         response: ModelResponse,
     ) -> None:
         """Called immediately after the agent receives the LLM response."""
-        pass    
+        pass
 
     async def on_tool_start(
         self,