Explicitly set the stack level of the warnings.warn call

The warn method from the warnings module uses a stacklevel of 1 by default. This will only show a stack trace for the line on which the warn method is called. It is therefore recommended to use a stacklevel of 2 or greater to provide more information to the user.

Author: ChrisLovering

pydis_core/_bot.py

@@ -73,7 +73,7 @@ def __init__(
         self.statsd_url = statsd_url
 
         if redis_session and not REDIS_AVAILABLE:
-            warnings.warn("redis_session kwarg passed, but async-rediscache not installed!")
+            warnings.warn("redis_session kwarg passed, but async-rediscache not installed!", stacklevel=2)
         elif redis_session:
             self.redis_session = redis_session