Bundler under Ruby 3.4 no longer treats `base64` as a default gem

[postmodern]

Seeing some spec failures due to Bundler not allowing async-dns to require base64.

LoadError:
  cannot load such file -- base64
# ./vendor/bundle/ruby/3.4.0/gems/async-dns-1.3.0/lib/async/dns/message.rb:24:in '<top (required)>'
# ./vendor/bundle/ruby/3.4.0/gems/async-dns-1.3.0/lib/async/dns.rb:27:in 'Kernel#require_relative'
# ./vendor/bundle/ruby/3.4.0/gems/async-dns-1.3.0/lib/async/dns.rb:27:in '<top (required)>'
# ./lib/ronin/dns/proxy/server.rb:24:in '<top (required)>'

https://github.com/ronin-rb/ronin-dns-proxy/actions/runs/13103082741/job/36553753530

This is apparently due to some recent changes to downgrade the base64 library from a default stdlib library and to a bundled gem. I believe you will need to add base64 to the gemspec, so other gems that depend on async-dns do not have to do the same.

[postmodern]

See PR #36.

[ioquatix]

I apologise.

I have not maintained this code for a long time. The last release was in 2021.

I have been working on refactoring this code to drop Async::IO.

I would like to release this as v1.4.0 but there will be some minor breaking changes; mainly the logger interfaces and the IO handling.

This problem is already fixed/resolved on main.

I'll work on this tomorrow and cut a release. I'll document all breaking changes in releases.md.