redis: updated to 5.0.8

Redis 5.0.8:
Upgrade urgency HIGH: This release fixes security issues.

This is a list of fixes in this release:
Fix Pi building needing -latomic, backport
fix impl of aof-child whitelist SIGUSR1 feature.
fix ThreadSafeContext lock/unlock function names
XREADGROUP should propagate XCALIM/SETID in MULTI/EXEC
Fix client flags to be int64 in module.c
Fix small bugs related to replica and monitor ambiguity
Fix lua related memory leak.
Free allocated sds in pfdebugCommand() to avoid memory leak.
Jump to right label on AOF parsing error.
Free fakeclient argv on AOF error.
Fix potential memory leak of rioWriteBulkStreamID().
Fix potential memory leak of clusterLoadConfig().
Fix bug on KEYS command where pattern starts with * followed by \x00 (null char).
Blocking XREAD[GROUP] should always reply with valid data (or timeout)
XCLAIM: Create the consumer only on successful claims.
Stream: Handle streamID-related edge cases
Fix ip and missing mode in RM_GetClusterNodeInfo().
Inline protocol: handle empty strings well.
Mark extern definition of SDS_NOINIT in sds.h
[FIX] revisit CVE-2015-8080 vulnerability
avoid sentinel changes promoted_slave to be its own replica.

(adam)