Remove audit comment from redis instrumentation

The security note belongs in the issue/PR, not in source code.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mitchh456

src/scout_apm/instruments/redis.py

@@ -1,10 +1,5 @@
 # coding=utf-8
 
-# Security note (redis-py 7.4.0, see https://github.com/scoutapp/scout_apm_python/issues/841):
-# redis-py < 7.4.0 leaked passwords in ConnectionPool.__repr__().
-# Scout APM is NOT affected: we only wrap Redis.execute_command() and
-# Pipeline.execute() and never call or log ConnectionPool.__repr__().
-
 import logging
 
 import wrapt