Upgrade go-redis/redis to v9

[bohehe]

Hello @LyricTian , thank you for contributing to this repo.
We're facing issue got 4 elements in cluster info address, expected 2 or 3, which requires to use github.com/go-redis/redis/v9.
redis/go-redis#2085
So I'd like to know if this repo is still been maintained? Is it possible to upgrade?

[bohehe]

Closed by #8 , thank you @LyricTian