Cast to a string to avoid floats erroring betterproto

rustplus/api/rust_api.py

@@ -88,7 +88,7 @@ async def send_team_message(self, message: str) -> None:
         await self._handle_ratelimit(2)
 
         app_send_message = AppSendMessage()
-        app_send_message.message = message
+        app_send_message.message = str(message)
 
         app_request = self._generate_protobuf()
         app_request.send_team_message = app_send_message