Fix Performance/StringIdentifierArgument cop (#28399)

spec/models/concerns/remotable_spec.rb

@@ -178,11 +178,11 @@ RSpec.describe Remotable do
 
             allow(foo).to receive(:public_send)
             foo.hoge_remote_url = url
-            expect(foo).to have_received(:public_send).with("download_#{hoge}!", url)
+            expect(foo).to have_received(:public_send).with(:"download_#{hoge}!", url)
 
             allow(foo).to receive(:public_send)
             foo.download_hoge!(url)
-            expect(foo).to have_received(:public_send).with("#{hoge}=", response_with_limit)
+            expect(foo).to have_received(:public_send).with(:"#{hoge}=", response_with_limit)
           end
         end
       end

spec/requests/omniauth_callbacks_spec.rb

@@ -4,7 +4,7 @@ require 'rails_helper'
 
 describe 'OmniAuth callbacks' do
   shared_examples 'omniauth provider callbacks' do |provider|
-    subject { post send "user_#{provider}_omniauth_callback_path" }
+    subject { post send :"user_#{provider}_omniauth_callback_path" }
 
     context 'with full information in response' do
       before do