Revert Ruby version to 3.2.0 for CI compatibility

The CI environment uses Ruby 3.2.0, not 3.2.3. Reverting to match CI configuration.

Co-authored-by: tuanle03 <66480375+tuanle03@users.noreply.github.com>

Author: Copilot

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby '3.2.3'
+ruby '3.2.0'
 
 # Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
 gem 'rails', '~> 8.1.1'