chore: Update RuboCop TargetRubyVersion to 3.2

Align RuboCop TargetRubyVersion with gemspec's required_ruby_version.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.rubocop.yml

@@ -13,7 +13,7 @@ inherit_mode:
 
 AllCops:
   NewCops: enable
-  TargetRubyVersion: 3.0
+  TargetRubyVersion: 3.2
   SuggestExtensions: false
   DisplayCopNames: true
   CacheRootDirectory: tmp/rubocop-cache

spec/rails_helper.rb

@@ -25,8 +25,7 @@ Dir[File.expand_path('support/**/*.rb', __dir__)].each { |f| require_relative f
 
 begin
   ActiveRecord::Migration.maintain_test_schema!
-rescue ActiveRecord::PendingMigrationError => e
-  puts e.to_s.strip
+rescue ActiveRecord::PendingMigrationError
   exit 1
 end