update ruby version to 3.0 in rubocop and gemspec

Author: dorianmariecom

.rubocop.yml

@@ -5,7 +5,7 @@ AllCops:
   - "**/vendor/**/*"
   - "**/db/schema.rb"
   NewCops: enable
-  TargetRubyVersion: 3.4
+  TargetRubyVersion: 3.0
 Layout/ClosingHeredocIndentation:
   Enabled: false
 Layout/FirstArgumentIndentation:

template-ruby.gemspec

@@ -17,5 +17,5 @@ Gem::Specification.new do |s|
   s.add_dependency "language-ruby"
   s.add_dependency "zeitwerk"
   s.metadata["rubygems_mfa_required"] = "true"
-  s.required_ruby_version = ">= 3.1"
+  s.required_ruby_version = ">= 3.0"
 end