rubocop: fix offences of the Lint/UnneededRequireStatement cop

.rubocop_todo.yml

@@ -648,13 +648,6 @@ Lint/StringConversionInInterpolation:
 Lint/UnderscorePrefixedVariableName:
   Enabled: false
 
-# Offense count: 2
-# Cop supports --auto-correct.
-Lint/UnneededRequireStatement:
-  Exclude:
-    - 'lib/pry/input_lock.rb'
-    - 'spec/spec_helpers/repl_tester.rb'
-
 # Offense count: 46
 # Cop supports --auto-correct.
 # Configuration parameters: IgnoreEmptyBlocks, AllowUnusedKeywordArguments.

lib/pry/input_lock.rb

@@ -1,5 +1,3 @@
-require 'thread'
-
 class Pry
   # There is one InputLock per input (such as STDIN) as two REPLs on the same
   # input makes things delirious. InputLock serializes accesses to the input so

spec/spec_helpers/repl_tester.rb

@@ -1,6 +1,5 @@
 # This is for super-high-level integration testing.
 
-require 'thread'
 require 'delegate'
 
 class ReplTester