Merge pull request #4640 from rubygems/no_resolv

Don't load `resolv` unnecessarily

(cherry picked from commit 9b054d9)

Author: simi

bundler/lib/bundler/fetcher/index.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require_relative "base"
-require "rubygems/remote_fetcher"
 
 module Bundler
   class Fetcher

bundler/lib/bundler/rubygems_integration.rb

@@ -529,10 +529,9 @@ def download_gem(spec, uri, path)
     end
 
     def gem_remote_fetcher
-      require "resolv"
+      require "rubygems/remote_fetcher"
       proxy = configuration[:http_proxy]
-      dns = Resolv::DNS.new
-      Gem::RemoteFetcher.new(proxy, dns)
+      Gem::RemoteFetcher.new(proxy)
     end
 
     def gem_from_path(path, policy = nil)

bundler/spec/bundler/fetcher/index_spec.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "rubygems/remote_fetcher"
+
 RSpec.describe Bundler::Fetcher::Index do
   let(:downloader)  { nil }
   let(:remote)      { nil }