Upgrade to Faraday 2

[olleolleolle]

The http client uses not much in terms of middlware, and the default adapter. It uses the ancient form of basic_auth, but that can be changed (see the upgrade notes in Faraday's repo).

You can find the code here:

gemstash/lib/gemstash/http_client.rb

Line 33 in df64b12

client = Faraday.new(upstream.to_s) do |config|

Faraday's also mentioned in the tests, so you can run some specs, and perhaps modify them, if needed.