Fix Rubocop offense for Style/RegexpLiteral

Author: stanhu

lib/omniauth/strategies/openid_connect.rb

@@ -434,7 +434,7 @@ def end_session_endpoint_is_valid?
       end
 
       def logout_path_pattern
-        @logout_path_pattern ||= %r{\A#{Regexp.quote(request_path)}#{options.logout_path}}
+        @logout_path_pattern ||= /\A#{Regexp.quote(request_path)}#{options.logout_path}/
       end
 
       def id_token_callback_phase