[rubygems/rubygems] Rename block variable

It's a dependency, not a specification.

ruby/rubygems@9d78f5aa14

Author: deivid-rodriguez

lib/bundler/definition.rb

@@ -833,7 +833,7 @@ def specs_changed?(source)
     end
 
     def dependencies_for_source_changed?(source, locked_source)
-      deps_for_source = @dependencies.select {|s| s.source == source }
+      deps_for_source = @dependencies.select {|dep| dep.source == source }
       locked_deps_for_source = locked_dependencies.select {|dep| dep.source == locked_source }
 
       deps_for_source.uniq.sort != locked_deps_for_source.sort