I’ve pushed an update to the chaotic-keyring package that will address this issue automatically. A normal garuda-update should suffice, although it’ll do a little complaining at first before updating the keyring and giving you the yes/no confirm prompt.
If you are still having issues, the command
garuda-update remote keyring
should fix any remaining problem you may have with the keyring. This should not be run unless necessary.
What happened
My GPG key expired, whoops! The solution was to simply extend the key’s validity period, sorry about that. The updated keyring package includes the updated key information from the keyservers, so you don’t have to manually run pacman-key --refresh-keys.