Removing monkeypatched `URI#unescape` since main branch follows ruby 2.7

actionpack/lib/action_controller.rb

@@ -65,5 +65,4 @@ require "active_support/core_ext/module/attribute_accessors"
 require "active_support/core_ext/load_error"
 require "active_support/core_ext/module/attr_internal"
 require "active_support/core_ext/name_error"
-require "active_support/core_ext/uri"
 require "active_support/inflector"

actionpack/lib/action_dispatch/routing/redirection.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "action_dispatch/http/request"
-require "active_support/core_ext/uri"
 require "active_support/core_ext/array/extract_options"
 require "rack/utils"
 require "action_controller/metal/exceptions"

activesupport/lib/active_support/core_ext/uri.rb

@@ -2,20 +2,6 @@
 
 require "uri"
 
-if RUBY_VERSION < "2.6.0"
-  require "active_support/core_ext/module/redefine_method"
-  URI::Parser.class_eval do
-    silence_redefinition_of_method :unescape
-    def unescape(str, escaped = /%[a-fA-F\d]{2}/)
-      # TODO: Are we actually sure that ASCII == UTF-8?
-      # YK: My initial experiments say yes, but let's be sure please
-      enc = str.encoding
-      enc = Encoding::UTF_8 if enc == Encoding::US_ASCII
-      str.dup.force_encoding(Encoding::ASCII_8BIT).gsub(escaped) { |match| [match[1, 2].hex].pack("C") }.force_encoding(enc)
-    end
-  end
-end
-
 module URI
   class << self
     def parser