Bump up rake-13.2 or higher because ostruct is removed from Ruby 3.5 …

…development version

https://github.com/rubygems/compact_index/actions/runs/12757338927/job/35557387580?pr=85#step:6:7

Gemfile

@@ -11,7 +11,7 @@ group :documentation, :optional => true do
 end
 
 group :development do
-  gem "rake", "~> 13.0"
+  gem "rake", "~> 13.2"
   gem "rspec", "~> 3"
   gem "rubocop", "~> 1.50.2"
   gem "rubocop-performance", :require => false