fix: add new line in the end of files

Author: donghao1393

src/mcp/shared/progress.py

@@ -51,4 +51,4 @@ async def progress(ctx: RequestContext, total: float | None = None):
     try:
         yield progress_ctx
     finally:
-        await progress_ctx.final_progress()
+        await progress_ctx.final_progress()

src/mcp/shared/session.py

@@ -315,4 +315,4 @@ def incoming_messages(
         | ReceiveNotificationT
         | Exception
     ]:
-        return self._incoming_message_stream_reader
+        return self._incoming_message_stream_reader