databases/redis-devel: Update to latest snapshot

Update license information. Upstream distributes source files under
dual license of Redis Source Available License v2 (RSALv2) and Server
Side Public License v1 (SSPLv1) now. Note that it doesn't apply to
stable versions already released (7,2.4, 7.0.15, 6.2.14, etc.).

Changes: https://github.com/redis/redis/compare/f17381a38...f95031c47