package/redis: bump to version 6.0.6

package/redis: bump to version 6.0.6

>From the release notes:

================================================================================
Redis 6.0.6     Released Mon Jul 20 09:31:30 IDT 2020
================================================================================

Upgrade urgency MODERATE: several bugs with moderate impact are fixed here.

The most important issues are listed here:

* Fix crash when enabling CLIENT TRACKING with prefix
* EXEC always fails with EXECABORT and multi-state is cleared
* RESTORE ABSTTL won't store expired keys into the db
* redis-cli better handling of non-pritable key names
* TLS: Ignore client cert when tls-auth-clients off
* Tracking: fix invalidation message on flush
* Notify systemd on Sentinel startup
* Fix crash on a misuse of STRALGO
* Few fixes in module API
* Fix a few rare leaks (STRALGO error misuse, Sentinel)
* Fix a possible invalid access in defrag of scripts (unlikely to cause real harm)

New features:

* LPOS command to search in a list
* Use user+pass for MIGRATE in redis-cli and redis-benchmark in cluster mode
* redis-cli support TLS for --pipe, --rdb and --replica options
* TLS: Session caching configuration support
================================================================================

Also, the reference hashes repo has moved to redis/redis-hashes
probably because the original maintainer has stepped down, see
http://antirez.com/news/133

Finally, the copyright year in the COPYING file has been updated,
and so does its sha256 checksum.

Signed-off-by: Titouan Christophe <titouan.christophe@railnova.eu>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>