Compatibility with Ruby 3.2.0

[bbonamin]

Final PR!

This change removes taint checking, which has been deprecated since Ruby 2.7 and has no effect.

Ruby 3.2.0 completely removes taint support, so this gem currently fails to compile under that Ruby version.

I don't think this should have any negative consequences for older Ruby versions.

See this thread for more info and links to similar gems with c extensions having taint checking removed: https://bugs.ruby-lang.org/issues/16131#note-24

Related changes in other gems of the family:

• wapiti in https://github.com/inukshuk/wapiti-ruby/pull/9
• anystyle-data in https://github.com/inukshuk/anystyle-data/pull/2
• anystyle in https://github.com/inukshuk/anystyle/pull/202

[inukshuk]

Thanks!