Drop support for Ruby 3.0

Ruby 3.0 is not maintained anymore.
Following our Maintaining guidelines,
we aim to support only one EOL version at a time.

The minimum Ruby version is going to be 3.1.

Author: stefannibrasil

.github/workflows/ruby.yml

@@ -38,11 +38,11 @@ jobs:
       fail-fast: false # don't fail all matrix builds if one fails
       matrix:
         ruby:
-          - '3.0'
           - '3.1'
           - '3.2'
           - '3.3'
           - '3.4'
+          - '4.0'
           - 'head'
           - truffleruby-head
     continue-on-error: ${{ endsWith(matrix.ruby, 'head') }}
@@ -53,13 +53,7 @@ jobs:
         ruby-version: ${{ matrix.ruby }}
 
     - name: Install dependencies
-      run:  |
-        if [[ "${{ matrix.ruby }}" < "3.1" ]]; then
-          gem install bundler:2.4.22
-          bundle _2.4.22_ install
-        else
-          bundle install
-        fi
+      run: bundle install
 
     - name: Run tests
       run: bundle exec rake test

.rubocop.yml

@@ -3,7 +3,7 @@ plugins:
   - rubocop-rake
 
 AllCops:
-  TargetRubyVersion: 3.0
+  TargetRubyVersion: 3.1
   NewCops: enable
 
 # Suppress noise for obvious operator precedence.

faker.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.bindir        = 'bin'
   spec.executables   = ['faker']
   spec.require_paths = ['lib']
-  spec.required_ruby_version = '>= 3.0'
+  spec.required_ruby_version = '>= 3.1'
 
   spec.metadata['changelog_uri'] = 'https://github.com/faker-ruby/faker/blob/main/CHANGELOG.md'
   spec.metadata['source_code_uri'] = 'https://github.com/faker-ruby/faker'