Uninstall the default 2.1.4 version of builder on the buildkite image
Uninstall the default 2.1.4 version of builder on the buildkite image

- Using specific version of  bundler(2.1.4) causes errors in make ci

Signed-off-by: Prajakta Purohit <e0b6074fb36005ab38b637036277c00627bb386c@chef.io>

chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server