Add Ruby 3.0 support (#16046)

* Fix issues with POSIX::Spawn, Terrapin and Ruby 3.0

Also improve the Terrapin monkey-patch for the stderr/stdout issue.

* Fix keyword argument handling throughout the codebase

* Monkey-patch Paperclip to fix keyword arguments handling in validators

* Change validation_extensions to please CodeClimate

* Bump microformats from 4.2.1 to 4.3.1

* Allow Ruby 3.0

* Add Ruby 3.0 test target to CircleCI

* Add test for admin dashboard warnings

* Fix admin dashboard warnings on Ruby 3.0

1 files changed, 2 insertions, 2 deletions

diff --git a/spec/mailers/notification_mailer_spec.rb b/spec/mailers/notification_mailer_spec.rb
index 3ae106218..9b645bad8 100644
--- a/spec/mailers/notification_mailer_spec.rb
+++ b/spec/mailers/notification_mailer_spec.rb
@@ -10,12 +10,12 @@ RSpec.describe NotificationMailer, type: :mailer do
     it 'renders subject localized for the locale of the receiver' do
       locale = %i(de en).sample
       receiver.update!(locale: locale)
-      expect(mail.subject).to eq I18n.t(*args, kwrest.merge(locale: locale))
+      expect(mail.subject).to eq I18n.t(*args, **kwrest.merge(locale: locale))
     end
 
     it 'renders subject localized for the default locale if the locale of the receiver is unavailable' do
       receiver.update!(locale: nil)
-      expect(mail.subject).to eq I18n.t(*args, kwrest.merge(locale: I18n.default_locale))
+      expect(mail.subject).to eq I18n.t(*args, **kwrest.merge(locale: I18n.default_locale))
     end
   end