/usr/lib/ruby/ is in ruby-mixlib-versioning 1.1.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/mixlib/
/usr/lib/ruby/vendor_ruby/mixlib/versioning/
/usr/lib/ruby/vendor_ruby/mixlib/versioning/exceptions.rb
/usr/lib/ruby/vendor_ruby/mixlib/versioning/format/
/usr/lib/ruby/vendor_ruby/mixlib/versioning/format/git_describe.rb
/usr/lib/ruby/vendor_ruby/mixlib/versioning/format/opscode_semver.rb
/usr/lib/ruby/vendor_ruby/mixlib/versioning/format/rubygems.rb
/usr/lib/ruby/vendor_ruby/mixlib/versioning/format/semver.rb
/usr/lib/ruby/vendor_ruby/mixlib/versioning/format.rb
/usr/lib/ruby/vendor_ruby/mixlib/versioning/version.rb
/usr/lib/ruby/vendor_ruby/mixlib/versioning.rb