pend on Windows for timeouts

Author: tagomoris

test/ruby/test_namespace.rb

@@ -758,6 +758,7 @@ def foo_namespace = Namespace.current
   end
 
   def test_loading_extension_libs_in_main_namespace
+    pend if /mswin|mingw/ =~ RUBY_PLATFORM # timeout on windows environments
     assert_separately([ENV_ENABLE_NAMESPACE], __FILE__, __LINE__, "#{<<~"begin;"}\n#{<<~'end;'}", ignore_stderr: true)
     begin;
       require "prism"