ci: declare mutex_m in Gemfile; it's been removed from ruby 3.4 #3092
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What problem is this PR intended to solve?
Ruby head builds fail because gem dependencies rely on mutex_m which has been removed from ruby head's default gems.
Let's add a section to the Gemfile for these (temporary) dependency declarations.
Also, remove the unnecessary dependency on NKF which has been removed from CRuby's default gems, but which doesn't have a JRuby gem (yet?).