Fix Puma HTTP Request/Response Smuggling vulnerability.

Author: nabinno

qwiklabs/deploy_a_ruby_on_rails_app_to_app_engine_flexible_environment/app_name/.ruby-version

@@ -1 +1 @@
-2.6.5
+2.6.8

qwiklabs/deploy_a_ruby_on_rails_app_to_app_engine_flexible_environment/app_name/Gemfile

@@ -1,14 +1,14 @@
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby '2.6.5'
+ruby '2.6.8'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 6.0.2', '>= 6.0.2.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.4'
 # Use Puma as the app server
-gem 'puma', '~> 4.1'
+gem 'puma', '~> 5.6.7'
 # Use SCSS for stylesheets
 gem 'sass-rails', '>= 6'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker