Autofix Rubocop Lint/SymbolConversion (#23683)

spec/controllers/auth/sessions_controller_spec.rb

@@ -127,7 +127,7 @@ RSpec.describe Auth::SessionsController, type: :controller do
 
         before do
           allow_any_instance_of(ActionDispatch::Request).to receive(:remote_ip).and_return(current_ip)
-          allow(UserMailer).to receive(:suspicious_sign_in).and_return(double('email', 'deliver_later!': nil))
+          allow(UserMailer).to receive(:suspicious_sign_in).and_return(double('email', deliver_later!: nil))
           user.update(current_sign_in_at: 1.month.ago)
           post :create, params: { user: { email: user.email, password: user.password } }
         end