Update dependency rails to v8

Author: renovate[bot]

Gemfile

@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby '2.4.5'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '~> 5.2.2', '>= 5.2.2.1'
+gem 'rails', '~> 8.0.0', '>= 8.0.0.1'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.4.4', '< 0.6.0'
 # Use Puma as the app server