fix: Gemfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-REXML-7814166

Gemfile

@@ -53,12 +53,12 @@ end
 group :test do
   # Adds support for Capybara system testing and selenium driver
   gem 'capybara', '>= 3.39'
-  gem 'selenium-webdriver'
+  gem 'selenium-webdriver', '>= 4.9.1'
   # Easy installation and use of web drivers to run system tests with browsers
   gem 'webdrivers'
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
-gem 'rubocop', '~> 0.89.1'
+gem 'rubocop', '~> 0.90.0'