style(rubocop): fix all safe auto correctable offenses

config/environments/test.rb

@@ -15,7 +15,7 @@ Rails.application.configure do
   # Configure public file server for tests with Cache-Control for performance.
   config.public_file_server.enabled = true
   config.public_file_server.headers = {
-    'Cache-Control' => 'public, max-age=3600'
+    "Cache-Control" => "public, max-age=3600"
   }
 
   # Show full error reports and disable caching.