Remove the deprecated max_retries attribute.
Remove the deprecated max_retries attribute.

knowsis/pika,vrtsystems/pika,renshawbay/pika-python3,zixiliuyue/pika,reddec/pika,vitaly-krugl/pika,shinji-s/pika,benjamin9999/pika,pika/pika,hugoxia/pika,Zephor5/pika,Tarsbot/pika,fkarb/pika-python3,jstnlef/pika,skftn/pika