Revert "remove hikari`s ubguard as redundant (err 521)"

This reverts commit f8a71f20a2.

heroku/dispatcher.py

@@ -145,6 +145,7 @@ class CommandDispatcher:
         self.raw_handlers = []
         self._external_bl: typing.List[int] = []
 
+        asyncio.ensure_future(self._external_bl_reload_loop())
 
     async def _handle_ratelimit(self, message: Message, func: callable) -> bool:
         if await self.security.check(message, security.OWNER):
@@ -712,3 +713,15 @@ class CommandDispatcher:
             await func(message)
         except Exception as e:
             await exception_handler(e, message, *args)
+
+    async def _external_bl_reload_loop(self):
+        while True:
+            with contextlib.suppress(Exception):
+                self._external_bl = (
+                    await utils.run_sync(
+                        requests.get,
+                        "https://ubguard.dan.tatar/blacklist.json",
+                    )
+                ).json()["blacklist"]
+
+            await asyncio.sleep(60)