[ruby/io-wait] Bump up the required ruby version
io-wait became a default gem at ruby 3.0. Even it can be installed on earlier versions, but the standard library will be loaded instead of the installed gem.
https://github.com/ruby/io-wait/commit/15b96736cd
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[ruby/io-wait] Bump up the required ruby version
io-wait became a default gem at ruby 3.0.
Even it can be installed on earlier versions, but the standard library
will be loaded instead of the installed gem.
https://github.com/ruby/io-wait/commit/15b96736cd