[ruby/rubygems] Make SafeYAML.load an alias of safe_load

Using Psych, load was actually more restrictive than safe_load. Using
Gem::YAMLSerializer they were identical. We might as well use the same
path for both methods.

ruby/rubygems@d8d927f889

Author: jhawthorn

lib/rubygems/safe_yaml.rb

@@ -48,17 +48,8 @@ def self.safe_load(input)
       end
     end
 
-    def self.load(input)
-      if Gem.use_psych?
-        ::Psych.safe_load(input, permitted_classes: [::Symbol])
-      else
-        Gem::YAMLSerializer.load(
-          input,
-          permitted_classes: PERMITTED_CLASSES,
-          permitted_symbols: PERMITTED_SYMBOLS,
-          aliases: aliases_enabled?
-        )
-      end
+    class << self
+      alias_method :load, :safe_load
     end
   end
 end