redis changes license

[Thomas Klausner <wiz%NetBSD.org@localhost>]

FYI:

https://redis.com/blog/redis-adopts-dual-source-available-licensing/

"Beginning today, all future versions of Redis will be released with
source-available licenses. Starting with Redis 7.4, Redis will be
dual-licensed under the Redis Source Available License (RSALv2) and
Server Side Public License (SSPLv1). Consequently, Redis will no
longer be distributed under the three-clause Berkeley Software
Distribution (BSD)."

 Thomas