Fix constant E_STRICT deprecation warning when running tests

E_STRICT was deprecated in PHP 8.4. It's used in tests/bootstrap.php, causing a deprecation warning to be emitted when running tests.

Author: TomA-R

tests/bootstrap.php

@@ -3,8 +3,8 @@
  * Whoops - php errors for cool kids
  * @author Filipe Dobreira <http://github.com/filp>
  *
- * Bootstraper for PHPUnit tests.
+ * Bootstrapper for PHPUnit tests.
  */
-error_reporting(E_ALL | E_STRICT);
+error_reporting(E_ALL);
 
 require_once __DIR__ . '/../vendor/autoload.php';