Fix: CI.

[dblock]

• locked concurrent-ruby because of Rails 7.0.8 fails to create an app with most recent concurrent-ruby version rails/rails#54260
• locked selenium-webdriver which fails with

SyntaxError: /home/runner/work/grape-on-rails/grape-on-rails/vendor/bundle/ruby/3.1.0/gems/selenium-webdriver-4.29.0/lib/selenium/webdriver/common/network.rb:73: no anonymous block parameter
/home/runner/work/grape-on-rails/grape-on-rails/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
/home/runner/work/grape-on-rails/grape-on-rails/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'