Update dependency rails to v8

Gemfile

@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby "3.3.6"
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem "rails", "~> 6.1.6"
+gem "rails", "~> 8.0.0"
 # Use postgresql as the database for Active Record
 gem "pg"
 # Use Puma as the app server