upgrade to laravel 8.x

vendor/phpunit/php-code-coverage/src/Exception/UnintentionallyCoveredCodeException.php

@@ -1,6 +1,6 @@
 <?php declare(strict_types=1);
 /*
- * This file is part of the php-code-coverage package.
+ * This file is part of phpunit/php-code-coverage.
  *
  * (c) Sebastian Bergmann <sebastian@phpunit.de>
  *
@@ -9,15 +9,14 @@
  */
 namespace SebastianBergmann\CodeCoverage;
 
-/**
- * Exception that is raised when code is unintentionally covered.
- */
-final class UnintentionallyCoveredCodeException extends RuntimeException
+use RuntimeException;
+
+final class UnintentionallyCoveredCodeException extends RuntimeException implements Exception
 {
     /**
      * @var array
      */
-    private $unintentionallyCoveredUnits = [];
+    private $unintentionallyCoveredUnits;
 
     public function __construct(array $unintentionallyCoveredUnits)
     {