Disallow PHPUnit 9.0-9.2 and show deprecations

composer.json

@@ -36,7 +36,7 @@
         "paragonie/random-lib": "^2",
         "php-mock/php-mock-phpunit": "^0.3 | ^1.1 | ^2.6",
         "php-parallel-lint/php-parallel-lint": "^1.3",
-        "phpunit/phpunit": ">=4.8.36",
+        "phpunit/phpunit": ">=4.8.36 <9.0.0 | >=9.3.0",
         "squizlabs/php_codesniffer": "^3.5",
         "yoast/phpunit-polyfills": "^1.0"
     },

tests/bootstrap.php

@@ -1,8 +1,6 @@
 <?php
 // @codingStandardsIgnoreFile
 
-error_reporting(E_ALL & ~E_DEPRECATED);
-
 use AspectMock\Kernel;
 
 require_once __DIR__ . '/../vendor/autoload.php'; // composer autoload