fix Lint/UnneededRequireStatement offenses

.rubocop_todo.yml

@@ -16,13 +16,6 @@ Lint/ReturnInVoidContext:
   Exclude:
     - 'lib/faraday/options/env.rb'
 
-# Offense count: 2
-# Cop supports --auto-correct.
-Lint/UnneededRequireStatement:
-  Exclude:
-    - 'lib/faraday.rb'
-    - 'lib/faraday/utils.rb'
-
 # Offense count: 41
 Metrics/AbcSize:
   Max: 86

lib/faraday.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'thread'
 require 'cgi'
 require 'set'
 require 'forwardable'

lib/faraday/utils.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'thread'
-
 require 'faraday/utils/headers'
 require 'faraday/utils/params_hash'