testing/keybase-client update to v6.2.4
Update keybase-client to v6.2.4 due to the breaking certificate issue keybase experienced. https://www.reddit.com/r/Keybase/comments/18vbqhu/messages_cant_be_sent_because_the_ssl_cert_expired/
https://gitlab.alpinelinux.org/alpine/aports/-/blob/master/testing/keybase-client/APKBUILD
https://github.com/keybase/client/releases
Thank you