devel/rubygem-io-event: Update to 1.12.0
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 ccdd63aac93d7b1fddca25a07a6ac355bad2538a)