build: Fix RuboCop linting issues

- Update TargetRubyVersion to 3.2 to match required_ruby_version
- Move duplicate puts statement out of conditional branches in test_matrix task

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: highb

.rubocop.yml

@@ -1,7 +1,7 @@
 inherit_from: .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: 3.1
+  TargetRubyVersion: 3.2
   NewCops: enable
 
 Style/NumericPredicate:

Rakefile

@@ -50,13 +50,12 @@ task :test_matrix do
     failed_versions << version unless success
   end
 
+  puts "\n#{'=' * 80}"
   if failed_versions.any?
-    puts "\n#{'=' * 80}"
     puts "FAILED on Ruby versions: #{failed_versions.join(', ')}"
     puts '=' * 80
     exit 1
   else
-    puts "\n#{'=' * 80}"
     puts 'All Ruby versions passed!'
     puts '=' * 80
   end