Add support for `valkey`

[kimminw00]

Valkey is backed by the Linux Foundation and has gained significant community and enterprise adoption since Redis license changes.

[ThiefMaster]

Didn't redis very recently revert their license change? Also, doesn't redis support work just fine with valkey?

[kimminw00]

While Redis is currently AGPL‑licensed, future license changes cannot be entirely ruled out.
Most existing Redis clients work seamlessly with Valkey, since it keeps the RESP protocol and many APIs compatible. However, Valkey is actively developing its own clients for feature support, performance, and compatibility.