Bump ruby/setup-ruby from 1.281.0 to 1.284.0 #3538

Job	Run time
lint	13s
Ruby 3.4 on ubuntu-latest with gemfiles/Gemfile-rails-main	3m 56s
Ruby 3.4 on windows-latest with Gemfile	50s
Ruby 3.3 on macos-latest with Gemfile	4m 35s
Ruby 3.4 on macos-latest with gemfiles/Gemfile-rails-main	4m 35s
Ruby 3.3 on ubuntu-latest with Gemfile	4m 16s
Ruby 3.4 on ubuntu-latest with Gemfile	3m 57s
Ruby 3.3 on macos-latest with gemfiles/Gemfile-rails-main	5m 14s
Ruby 3.3 on ubuntu-latest with gemfiles/Gemfile-rails-main	4m 41s
Ruby 3.3 on windows-latest with Gemfile	59s
Ruby 3.4 on macos-latest with Gemfile	3m 44s
Ruby 3.4 on windows-latest with gemfiles/Gemfile-rails-main	11m 57s
Ruby 3.3 on windows-latest with gemfiles/Gemfile-rails-main	12m 38s
	1h 1m 35s

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