[rubygems/rubygems] Rename molinillo wrapper file to vendored_molinillo.rb

https://github.com/rubygems/rubygems/commit/d7c15f6fd7

lib/rubygems/resolver.rb

@@ -11,7 +11,7 @@ require_relative "util/list"
 # all the requirements.
 
 class Gem::Resolver
-  require_relative "resolver/molinillo"
+  require_relative "vendored_molinillo"
 
   ##
   # If the DEBUG_RESOLVER environment variable is set then debugging mode is

lib/rubygems/resolver/molinillo.rb

@@ -1,3 +0,0 @@
-# frozen_string_literal: true
-
-require_relative "../vendor/molinillo/lib/molinillo"

lib/rubygems/vendored_molinillo.rb

@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+require_relative "vendor/molinillo/lib/molinillo"