Ruby 3 compatible

[Brett Dudo]

Tried to update my app to ruby 3 but the airrecord gem depends on an older version of faraday which depends on an older version of net-http-persistent which does not work with ruby 3 Net::HTTP.

Any effort to have ruby 3 compatibility already? or should I submit a PR?

[Simon Eskildsen]

I think fixed with allowing faraday 2 now in master?
a079e87