Use bundler 2.4.9 for rake commands

Explicitly use bundler 2.4.9 for bundle exec rake commands to ensure
compatibility with the lockfile's BUNDLED WITH version.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

.github/workflows/ruby.yml

@@ -51,8 +51,8 @@ jobs:
       - name: Restore Gemfile.lock if modified by bundle install
         run: git checkout Gemfile.lock
       - run: yarn
-      - run: bundle exec rake react:update
-      - run: bundle exec rake ujs:update
+      - run: bundle _2.4.9_ exec rake react:update
+      - run: bundle _2.4.9_ exec rake ujs:update
       - run: ./check_for_uncommitted_files.sh
 
   test: