Update dependency rails to v8

Gemfile

@@ -7,7 +7,7 @@ gem 'faraday'
 gem 'faraday_middleware'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '~> 6.1'
+gem 'rails', '~> 8.0'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server