redis: bump to version 4.0.11

>From the release notes
(https://raw.githubusercontent.com/antirez/redis/4.0/00-RELEASENOTES

):

Upgrade urgency HIGH: not critical but very important bugs fixed.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Reviewed-by: Titouan Christophe <titouan.christophe@railnova.eu>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>