[ruby/strscan] Support Ractor#value

(https://github.com/ruby/strscan/pull/157)

This is same as https://github.com/ruby/stringio/pull/134

---------

https://github.com/ruby/strscan/commit/141f9cf9b6

Co-authored-by: Koichi Sasada <ko1@atdot.net>

test/strscan/test_ractor.rb

@@ -8,6 +8,10 @@ class TestStringScannerRactor < Test::Unit::TestCase
 
   def test_ractor
     assert_in_out_err([], <<-"end;", ["stra", " ", "strb", " ", "strc"], [])
+      class Ractor
+        alias value take unless method_defined? :value # compat with Ruby 3.4 and olders
+      end
+
       require "strscan"
       $VERBOSE = nil
       r = Ractor.new do