update mina and ruby

Gemfile

@@ -1,8 +1,8 @@
 source 'https://rubygems.org'
-ruby '2.7.5'
+ruby '2.7.6'
 
 gem 'rails' , "> 5.2"
-gem "passenger" , "6.0.13"
+
 
 gem 'sass-rails'
 gem 'uglifier'
@@ -23,9 +23,14 @@ gem "rx-file" , git: "https://github.com/ruby-x/rx-file"
 gem "haml-coderay"
 gem 'mini_racer'
 
+group :production do
+  gem "passenger" , "6.0.15"
+end
+
 group :development, :test do
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
   gem 'rspec-rails'
+  gem "puma"
 end
 
 group :test do