Fix Object#[tainted?|untaint] deprecation warnings
Theses methods are deprecated in Ruby 3.0 and will be removed in Ruby 3.2.
Occurrences
/data/cache/bundle-2.7.2/ruby/3.0.0/gems/prometheus-client-mmap-0.12.0/lib/prometheus/client/helper/entry_parser.rb:16: warning: Object#tainted? is deprecated and will be removed in Ruby 3.2
/data/cache/bundle-2.7.2/ruby/3.0.0/gems/fast_gettext-1.6.0/lib/fast_gettext/translation_repository/base.rb:48: warning: Object#untaint is deprecated and will be removed in Ruby 3.2
Edited by Matthias Käppler