[ruby/time] Removed workaround for assert_ractor

ruby/time@337410e971

Author: hsbt

test/test_time.rb

@@ -74,9 +74,6 @@ def test_rfc2822_nonlinear
   if defined?(Ractor)
     def test_rfc2822_ractor
       assert_ractor(<<~RUBY, require: 'time')
-        class Ractor
-          alias value take unless method_defined? :value # compat with Ruby 3.4 and olders
-        end
         actual = Ractor.new { Time.rfc2822("Fri, 21 Nov 1997 09:55:06 -0600") }.value
         assert_equal(Time.utc(1997, 11, 21, 9, 55, 6) + 6 * 3600, actual)
       RUBY