[ruby/prism] Remove unneeded ripper requires

Ripper is either not used or loaded where it is actually needed

https://github.com/ruby/prism/commit/a73a4fb00c

lib/prism/translation/ripper.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 # :markup: markdown
 
-require "ripper"
-
 module Prism
   module Translation
     # This class provides a compatibility layer between prism and Ripper. It

test/prism/magic_comment_test.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require_relative "test_helper"
+require "ripper"
 
 module Prism
   class MagicCommentTest < TestCase

test/prism/ruby/ripper_test.rb

@@ -3,6 +3,7 @@
 return if RUBY_VERSION < "3.3" || RUBY_ENGINE != "ruby"
 
 require_relative "../test_helper"
+require "ripper"
 
 module Prism
   class RipperTest < TestCase

test/prism/test_helper.rb

@@ -2,7 +2,6 @@
 
 require "prism"
 require "pp"
-require "ripper"
 require "stringio"
 require "test/unit"
 require "tempfile"