redis: security bump to version 3.2.12

redis: security bump to version 3.2.12

>From the release notes:

================================================================================
Redis 3.2.12     Released Wed Jun 13 12:43:01 CEST 2018
================================================================================

Upgrade urgency CRITICAL:

* Multilple security issues fixed.
* Backport of an older AOF fsync=always fix. Check 4.x release notes.
* Backport of a *SCAN bug. Sometimes elements could be missing from the scan.
* Other minor things.

https://raw.githubusercontent.com/antirez/redis/3.2/00-RELEASENOTES

For more details about the lua related security issues, see the blog:

http://antirez.com/news/119

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>