Upgrade to Faraday v2

[roback]

Currently we use Faraday v1 in this gem:

twingly-http/twingly-http.gemspec

Line 17 in d2dc92d

s.add_dependency "faraday", "~> 1", ">= 1.0.1"

As Faraday v2 was released a few years ago, so we should really update to the new version. There's an upgrade guide at https://github.com/lostisland/faraday/blob/main/UPGRADING.md

Note that we have a few custom middleware here that may need to be rewritten as well: https://github.com/twingly/twingly-http/tree/d2dc92d7385bcc78308134d5dc3a2764355867cd/lib/faraday