Update from 6.0.5 to 6.0.6.

<ChangeLog>

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

</ChangeLog>