Merge pull request #323 from alphagov/dependabot/bundler/rspec-rails-tw-6

Update rspec-rails requirement from ~> 5 to ~> 6

Author: ChrisBAshton

govuk_admin_template.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |gem|
 
   gem.add_development_dependency "capybara", "~> 3"
   gem.add_development_dependency "climate_control", "~> 1"
-  gem.add_development_dependency "rspec-rails", "~> 5"
+  gem.add_development_dependency "rspec-rails", "~> 6"
   gem.add_development_dependency "rubocop-govuk", "5.0.2"
   gem.add_development_dependency "sassc-rails", "~> 2"
 end