Frozen literal string warnings

[morgoth]

When running on Ruby 3.4 and having Ruby warnings enabled, the following warning is emited (among few others)

/home/runner/work/trmz/trmz/vendor/bundle/ruby/3.4.0/gems/barby-0.7.0/lib/barby/barcode/qr_code.rb:56: warning: literal string will be frozen in the future (run with --debug-frozen-string-literal for more information)

https://www.ruby-lang.org/en/news/2024/12/25/ruby-3-4-0-released/

[javierjulio]

I'm noticing the same warning in other files too, for example, code_25_interleaved.rb:

/Users/j.julio/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/barby-0.6.9/lib/barby/barcode/code_25_interleaved.rb:51: warning: literal string will be frozen in the future (run with --debug-frozen-string-literal for more information)

[crevete]

@toretore Hi, is it possible to cut a release ASAP to fix these warnings with Ruby 3.4?

[r-reload]

I created PR #126 with the goal to fix this issue throughout the code. @toretore I am willing to help fix this as we use Barby in our production code.