refactor: add return type

Author: kenjis

system/Debug/ExceptionHandler.php

@@ -36,16 +36,14 @@ final class ExceptionHandler extends BaseExceptionHandler implements ExceptionHa
 
     /**
      * Determines the correct way to display the error.
-     *
-     * @return void
      */
     public function handle(
         Throwable $exception,
         RequestInterface $request,
         ResponseInterface $response,
         int $statusCode,
         int $exitCode
-    ) {
+    ): void {
         // ResponseTrait needs these properties.
         $this->request  = $request;
         $this->response = $response;

system/Debug/ExceptionHandlerInterface.php

@@ -19,14 +19,12 @@ interface ExceptionHandlerInterface
 {
     /**
      * Determines the correct way to display the error.
-     *
-     * @return void
      */
     public function handle(
         Throwable $exception,
         RequestInterface $request,
         ResponseInterface $response,
         int $statusCode,
         int $exitCode
-    );
+    ): void;
 }