devel/rubygem-io-event: Update to 1.12.1
Changes: https://github.com/socketry/io-event/releases
https://github.com/socketry/io-event/blob/main/releases.md https://github.com/socketry/io-event/commits/main
(cherry picked from commit d77cdd3080ab54585ba16f0041cc945ec4510414)