Remove Ruby 3.2 support from CI

Author: smasato

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
     uses: ruby/actions/.github/workflows/ruby_versions.yml@master
     with:
       engine: cruby-truffleruby
-      min_version: 3.2
+      min_version: 3.3
 
   build:
     needs: ruby-versions