Issue with string gem

[n-rodriguez]

Hi there!

tty-markdown depends on strings (https://github.com/piotrmurach/tty-markdown/blob/master/tty-markdown.gemspec#L35)
strings depends on unicode_utils (https://github.com/piotrmurach/strings/blob/master/strings.gemspec#L27)

unicode_utils is not compatible with frozen_string_literal lang/unicode_utils#13 and don't seem to be maintained 😢

And so it breaks with :

/Users/nicolas/PROJECTS/CONCERTO/concerto/.bundle/ruby/3.3.0/gems/unicode_utils-1.4.0/lib/unicode_utils/read_cdata.rb:124:in `force_encoding': can't modify frozen String: "x", created at /Users/nicolas/PROJECTS/CONCERTO/concerto/.bundle/ruby/3.3.0/gems/unicode_utils-1.4.0/lib/unicode_utils/read_cdata.rb:123 (FrozenError)

Thank you!

[n-rodriguez]

Closed in favor of piotrmurach/strings#22