Update stubs/pika/pika/adapters/blocking_connection.pyi

Co-authored-by: Sebastian Rittau <sebastian.rittau@zfutura.de>

Author: ndevenish

stubs/pika/pika/adapters/blocking_connection.pyi

@@ -71,7 +71,7 @@ class BlockingConnection:
     def remove_timeout(self, timeout_id) -> None: ...
     def update_secret(self, new_secret, reason) -> None: ...
     def close(self, reply_code: int = 200, reply_text: str = "Normal shutdown") -> None: ...
-    def process_data_events(self, time_limit: int | None = 0): ...
+    def process_data_events(self, time_limit: int | None = 0) -> None: ...
     def sleep(self, duration: float) -> None: ...
     def channel(self, channel_number: int | None = None) -> BlockingChannel: ...
     @property