bundle released version of Rack 2

Author: amatsuda

Gemfile

@@ -4,5 +4,5 @@ gemspec
 
 gem 'actionpack', github: 'rails/rails', branch: 'main'
 gem 'railties', github: 'rails/rails', branch: 'main'
-gem 'rack', github: 'rack/rack', branch: 'master', ref: "e84bb296d1a16b32159608596f1f5a23b2016633"
+gem 'rack', '~> 2.2'
 gem 'sprockets', github: 'rails/sprockets', branch: '3.x'