[rubygems/rubygems] Remove unnecessary remapping of dependencies

Sometimes we'll resolve using bare `Gem::Dependency` instances rather
than `Bundler::Dependency` instances, which is fine, simpler, and saves
some memory.

When resolving from scratch a Gemfile including only `"gem "rails", "~>
8.0.1"`, I get the following results:

### Before

Total allocated: 277.48 MB (3384318 objects)
Total retained:  117.53 MB (1338657 objects)

### After

Total allocated: 265.06 MB (3186053 objects)
Total retained:  116.98 MB (1302280 objects)

https://github.com/rubygems/rubygems/commit/c6dc2966c5

lib/bundler/endpoint_specification.rb

@@ -36,6 +36,7 @@ module Bundler
     def dependencies
       @dependencies ||= @unbuilt_dependencies.map! {|dep, reqs| build_dependency(dep, reqs) }
     end
+    alias_method :runtime_dependencies, :dependencies
 
     # needed for standalone, load required_paths from local gemspec
     # after the gem is installed
@@ -167,7 +168,7 @@ module Bundler
     end
 
     def build_dependency(name, requirements)
-      Gem::Dependency.new(name, requirements)
+      Dependency.new(name, requirements)
     end
   end
 end

lib/bundler/resolver/spec_group.rb

@@ -40,7 +40,7 @@ module Bundler
 
       def dependencies
         @dependencies ||= @specs.flat_map do |spec|
-          __dependencies(spec) + metadata_dependencies(spec)
+          spec.runtime_dependencies + metadata_dependencies(spec)
         end.uniq.sort
       end
 
@@ -72,15 +72,6 @@ module Bundler
         @specs.first
       end
 
-      def __dependencies(spec)
-        dependencies = []
-        spec.dependencies.each do |dep|
-          next if dep.type == :development
-          dependencies << Dependency.new(dep.name, dep.requirement)
-        end
-        dependencies
-      end
-
       def metadata_dependencies(spec)
         [
           metadata_dependency("Ruby", spec.required_ruby_version),