Update dependency puma to v6

Author: mend-for-github-com[bot]

modules/swagger-codegen/src/main/resources/rails5/Gemfile

@@ -6,7 +6,7 @@ gem 'rails', '~> 5.0.0'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.3.18', '< 0.5'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 6.1', '>= 6.1.0-java'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.0'
 # Use Redis adapter to run Action Cable in production

samples/server/petstore/rails5/Gemfile

@@ -6,7 +6,7 @@ gem 'rails', '~> 5.0.0'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.3.18', '< 0.5'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 6.1', '>= 6.1.0-java'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.0'
 # Use Redis adapter to run Action Cable in production