[rubygems/rubygems] Surpressing warning for CGI library of Ruby 3.5+

```
❯ bin/rspec ./spec/bundler/friendly_errors_spec.rb
/Users/hsbt/Documents/github.com/rubygems/rubygems/bundler/spec/bundler/friendly_errors_spec.rb:5: warning: CGI library is removed from Ruby 3.5. Please use cgi/escape instead for CGI.escape and CGI.unescape features.
If you need to use the full features of CGI library, Please install cgi gem.
```

ruby/rubygems@a23a951004

Author: hsbt

spec/bundler/bundler/friendly_errors_spec.rb

@@ -2,7 +2,8 @@
 
 require "bundler"
 require "bundler/friendly_errors"
-require "cgi"
+require "cgi/escape"
+require "cgi/util" unless defined?(CGI::EscapeExt)
 
 RSpec.describe Bundler, "friendly errors" do
   context "with invalid YAML in .gemrc" do