If you set up the symlinks to make ruby 3.1 the system
ruby, don't forget to remove the following files:

 rm /usr/local/bin/ruby
 rm /usr/local/bin/bundle
 rm /usr/local/bin/bundler
 rm /usr/local/bin/erb
 rm /usr/local/bin/gem
 rm /usr/local/bin/irb
 rm /usr/local/bin/racc
 rm /usr/local/bin/rake
 rm /usr/local/bin/rbs
 rm /usr/local/bin/rdbg
 rm /usr/local/bin/rdoc
 rm /usr/local/bin/ri
 rm /usr/local/bin/typeprof
