[rubygems/rubygems] Fix locale dependent spec failure

ruby/rubygems@1fd818743e

Author: deivid-rodriguez

spec/bundler/runtime/setup_spec.rb

@@ -774,7 +774,7 @@ def clean_load_path(lp)
       run <<~RUBY
         puts ENV['MANPATH']
         require "open3"
-        puts Open3.capture2e("man", "ls")[0]
+        puts Open3.capture2e({ "LC_ALL" => "C" }, "man", "ls")[0]
       RUBY
 
       lines = out.split("\n")