[rubygems/rubygems] Reenable skipped specs in truffleruby since they should be fixed

ruby/rubygems@a7cbec95c1

Author: deivid-rodriguez

test/rubygems/test_gem_safe_marshal.rb

@@ -234,8 +234,6 @@ def test_floats
   end
 
   def test_link_after_float
-    pend "Marshal.load of links and floats is broken on truffleruby, see https://github.com/oracle/truffleruby/issues/3747" if RUBY_ENGINE == "truffleruby"
-
     a = []
     a << a
     assert_safe_load_as [0.0, a, 1.0, a]

test/rubygems/test_gem_specification.rb

@@ -3664,8 +3664,6 @@ def test_version_change_reset_cache_file
   end
 
   def test__load_fixes_Date_objects
-    pend "Marshal.load of links and floats is broken on truffleruby, see https://github.com/oracle/truffleruby/issues/3747" if RUBY_ENGINE == "truffleruby"
-
     spec = util_spec "a", 1
     spec.instance_variable_set :@date, Date.today