Add bundler-audit gem to fix CI

Rails 8.1 generates bin/bundler-audit but doesn't include the gem by default.

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

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

Gemfile

@@ -51,6 +51,9 @@ group :development, :test do
 
   # Omakase Ruby styling [https://github.com/rails/rubocop-rails-omakase/]
   gem "rubocop-rails-omakase", require: false
+
+  # Audit bundle for known vulnerabilities
+  gem "bundler-audit", require: false
 end
 
 group :development do

Gemfile.lock

@@ -116,6 +116,9 @@ GEM
     brakeman (7.0.2)
       racc
     builder (3.3.0)
+    bundler-audit (0.9.2)
+      bundler (>= 1.2.0, < 3)
+      thor (~> 1.0)
     capybara (3.40.0)
       addressable
       matrix
@@ -242,7 +245,6 @@ GEM
     regexp_parser (2.10.0)
     reline (0.6.1)
       io-console (~> 0.5)
-    rexml (3.4.1)
     rubocop (1.76.0)
       json (~> 2.3)
       language_server-protocol (~> 3.17.0.2)
@@ -272,14 +274,7 @@ GEM
       rubocop-performance (>= 1.24)
       rubocop-rails (>= 2.30)
     ruby-progressbar (1.13.0)
-    rubyzip (2.3.2)
     securerandom (0.4.1)
-    selenium-webdriver (4.33.0)
-      base64 (~> 0.2)
-      logger (~> 1.4)
-      rexml (~> 3.2, >= 3.2.5)
-      rubyzip (>= 1.2.2, < 3.0)
-      websocket (~> 1.0)
     solid_cable (3.0.8)
       actioncable (>= 7.2)
       activejob (>= 7.2)
@@ -326,7 +321,6 @@ GEM
       bindex (>= 0.4.0)
       railties (>= 6.0.0)
     webrick (1.9.1)
-    websocket (1.2.11)
     websocket-driver (0.8.0)
       base64
       websocket-extensions (>= 0.1.0)
@@ -345,6 +339,7 @@ DEPENDENCIES
   bcrypt
   bootsnap
   brakeman
+  bundler-audit
   capybara
   cuprite
   debug