Use asyncio from redis instead of aioredis to make app python 3.11 compatible

modoboa/policyd/core.py

@@ -8,7 +8,7 @@ import logging
 
 import aiosmtplib
 from dateutil.relativedelta import relativedelta
-import aioredis
+from redis import asyncio as aioredis
 
 from django.conf import settings
 from django.db import connections

requirements.txt

@@ -37,7 +37,6 @@ rrdtool>=0.1.10
 qrcode
 
 aiosmtplib
-aioredis==2.0.1
 
 # PDF credentials
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