Bump to Faraday 2

Faraday 2 was released in early 2022. As part of this major release,
authentication helper methods (such as basic_auth) were removed from the
Connection object and into middleware.

This commit updates vmfloaty's dependency on Faraday to ~> 2 and updates
the Http class to use the new authentication middleware.

This upgrade is helpful because, in a CI context, vmfloaty is often
installed alongside other gems that use Faraday >= 2, and vmfloaty's
current dependency on Faraday ~> 1.5, >= 1.5.1 can cause unexpected
dependency resolution.

You can read more about this unexpected dependency behavior in this
GitHub issue: https://github.com/puppetlabs/orchestrator_client-ruby/issues/41

lib/vmfloaty/http.rb

@@ -37,7 +37,7 @@ class Http
 
     Faraday.new(url: url, ssl: { verify: false }) do |faraday|
       faraday.request :url_encoded
-      faraday.request :basic_auth, user, password
+      faraday.request :authorization, :basic, user, password
       faraday.response :logger if verbose
       faraday.adapter Faraday.default_adapter
     end