Fix Ruby version mismatch for CI

CI is configured to use Ruby 3.4.6, but Gemfile was accidentally set to 3.4.3 during local development. This was causing bundle install to fail in CI with exit code 18.

Updated:
- Gemfile: ruby 3.4.3 → 3.4.6
- Gemfile.lock: ruby 3.4.3p32 → 3.4.6p32

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

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

Author: justin808

Gemfile

@@ -3,7 +3,7 @@
 source "https://rubygems.org"
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby "3.4.3"
+ruby "3.4.6"
 
 gem "react_on_rails", "16.1.1"
 gem "shakapacker", "9.1.0"

Gemfile.lock

@@ -502,7 +502,7 @@ DEPENDENCIES
   web-console
 
 RUBY VERSION
-   ruby 3.4.3p32
+   ruby 3.4.6p32
 
 BUNDLED WITH
    2.4.17