Move to Faraday 2.x

It does not attempt to support Faraday 1.x as well because dependency
wise it would be impossible to pull in the correct middleware. That is
why a hard switch was made.

This moves the minimum Ruby version to 2.6 since that's what Faraday 2
has as the minimum version.

It also pulls in faraday-follow_redirects, which was previously part of
Faraday itself.

The registration is now done without a lamba since it's allowed to pass
in a constant.

CI is also modified to test on all actual Ruby version that currently
match the required_ruby_version in the gemspec. That is, 2.6 - 3.1.

.github/workflows/ruby-rspec.yml

@@ -14,7 +14,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.7, 2.6, 2.5]
+        ruby:
+          - '3.1'
+          - '3.0'
+          - '2.7'
+          - '2.6'
 
     steps:
       - uses: actions/checkout@v1

lib/puppet_forge/connection.rb

@@ -1,7 +1,7 @@
 require 'puppet_forge/connection/connection_failure'
 
 require 'faraday'
-require 'faraday_middleware'
+require 'faraday/follow_redirects'
 
 module PuppetForge
   # Provide a common mixin for adding a HTTP connection to classes.
@@ -115,7 +115,7 @@ def make_connection(url, adapter_args = nil, opts = {})
       end
 
       Faraday.new(url, options) do |builder|
-        builder.use FaradayMiddleware::FollowRedirects
+        builder.use Faraday::FollowRedirects::Middleware
         builder.response(:json, :content_type => /\bjson$/, :parser_options => { :symbolize_names => true })
         builder.response(:raise_error)
         builder.use(:connection_failure)

lib/puppet_forge/connection/connection_failure.rb

@@ -22,4 +22,4 @@ def call(env)
   end
 end
 
-Faraday::Middleware.register_middleware(:connection_failure => lambda { PuppetForge::Connection::ConnectionFailure })
+Faraday::Middleware.register_middleware(:connection_failure => PuppetForge::Connection::ConnectionFailure)

puppet_forge.gemspec

@@ -18,10 +18,10 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = '>= 2.4.0'
+  spec.required_ruby_version = '>= 2.6.0'
 
-  spec.add_runtime_dependency "faraday", "~> 1.3"
-  spec.add_runtime_dependency "faraday_middleware", "~> 1.0"
+  spec.add_runtime_dependency "faraday", "~> 2.0"
+  spec.add_runtime_dependency "faraday-follow_redirects", "~> 0.3.0"
   spec.add_dependency "semantic_puppet", "~> 1.0"
   spec.add_dependency "minitar"