Update dependency rails to v8

Author: renovate[bot]

Gemfile

@@ -9,7 +9,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby "3.1.5"
 
 # Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
-gem "rails", "~> 7.0.8"
+gem "rails", "~> 8.0.0"
 
 # The original asset pipeline for Rails [https://github.com/rails/sprockets-rails]
 # gem "sprockets-rails"