Merge branch 'hchouraria-fix-flaky-imap-authentication-check-spec' into 'master'

Fix order-dependent spec failure in imap_authentication_check_spec.rb

See merge request gitlab-org/gitlab!63339

spec/lib/gitlab/mail_room/mail_room_spec.rb

@@ -33,6 +33,10 @@ RSpec.describe Gitlab::MailRoom do
     described_class.instance_variable_set(:@enabled_configs, nil)
   end
 
+  after do
+    described_class.instance_variable_set(:@enabled_configs, nil)
+  end
+
   describe '#enabled_configs' do
     before do
       allow(described_class).to receive(:load_yaml).and_return(configs)