Fix a few more typing errors

Author: VegetarianOrc

temporalio/contrib/openai_agents/_trace_interceptor.py

@@ -426,11 +426,11 @@ async def start_child_workflow(
             input=input,
         )
         if sys.version_info >= (3, 11):
-            handle = await asyncio.create_task(
+            handle: temporalio.workflow.ChildWorkflowHandle = await asyncio.create_task(
                 self.next.start_child_workflow(input), context=ctx
             )
         else:
-            handle = await ctx.run(
+            handle: temporalio.workflow.ChildWorkflowHandle = await ctx.run(
                 asyncio.create_task, self.next.start_child_workflow(input)
             )
         if span:

temporalio/contrib/opentelemetry.py

@@ -421,11 +421,9 @@ async def handle_signal(self, input: temporalio.worker.HandleSignalInput) -> Non
         # header given
         with self._top_level_workflow_context(success_is_complete=False) as ctx:
             if sys.version_info >= (3, 11):
-                return await asyncio.create_task(
-                    self._handle_signal(input), context=ctx
-                )
+                await asyncio.create_task(self._handle_signal(input), context=ctx)
             else:
-                return await ctx.run(asyncio.create_task, self._handle_signal(input))
+                await ctx.run(asyncio.create_task, self._handle_signal(input))
 
     async def _handle_signal(self, input: temporalio.worker.HandleSignalInput) -> None:
         """Implementation of