Create a default TCPConnector with no limit

The default implementation only allows for 100 concurrent connections
and during heavy sharding (>=100 shards) this can end up freezing
shards.

discord/http.py

@@ -324,7 +324,7 @@ class HTTPClient:
         unsync_clock: bool = True,
     ) -> None:
         self.loop: asyncio.AbstractEventLoop = asyncio.get_event_loop() if loop is None else loop
-        self.connector = connector
+        self.connector: aiohttp.BaseConnector = connector or aiohttp.TCPConnector(limit=0)
         self.__session: aiohttp.ClientSession = MISSING  # filled in static_login
         self._locks: weakref.WeakValueDictionary = weakref.WeakValueDictionary()
         self._global_over: asyncio.Event = asyncio.Event()