Use Rubocop plugins, use Ruby 3.0 as minimum version everywhere

Author: olivier-thatch

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.2
+          ruby-version: 3.0
           bundler-cache: true
           rubygems: latest
 
@@ -29,7 +29,7 @@ jobs:
         grape: [ '~> 2.0.0', 'head' ]
         grape_swagger: [ '~> 2.0.3', 'head' ]
         grape_entity: [ '~> 1.0.1', 'head' ]
-        ruby: [ '3.1', '3.4', 'head' ]
+        ruby: [ '3.0', '3.4', 'head' ]
         # Exclude combinations that are not supported.
         exclude:
           - { grape_swagger: '~> 2.0.3', grape: 'head' }

.rubocop.yml

@@ -3,11 +3,11 @@ AllCops:
   Exclude:
     - vendor/**/*
   TargetRubyVersion:
-    2.7
+    3.0
 
 inherit_from: .rubocop_todo.yml
 
-require:
+plugins:
   - rubocop-rake
   - rubocop-rspec
 

.rubocop_todo.yml

@@ -1,18 +1,11 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2025-05-12 21:32:47 UTC using RuboCop version 1.75.5.
+# on 2025-05-28 16:52:10 UTC using RuboCop version 1.75.8.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 1
-# Configuration parameters: Severity, Include.
-# Include: **/*.gemspec
-Gemspec/RequiredRubyVersion:
-  Exclude:
-    - 'grape-swagger-entity.gemspec'
-
 # Offense count: 3
 # Configuration parameters: AllowedMethods.
 # AllowedMethods: enums

Gemfile

@@ -34,9 +34,12 @@ group :development, :test do
   gem 'rake'
   gem 'rdoc'
   gem 'rspec'
-  gem 'rubocop'
-  gem 'rubocop-rake'
-  gem 'rubocop-rspec'
+end
+
+group :development do
+  gem 'rubocop', '>= 1.72', require: false
+  gem 'rubocop-rake', '>= 0.7', require: false
+  gem 'rubocop-rspec', '>= 3.5.0', require: false
 end
 
 group :test do