Update PHPUnit to 9.3

$ composer update phpunit/phpunit nikic/php-parser --with-dependencies

composer.json

@@ -42,7 +42,7 @@
         "jetbrains/phpstorm-stubs": "^2019.1",
         "nikic/php-parser": "^4.4",
         "phpstan/phpstan": "^0.12.31",
-        "phpunit/phpunit": "^9.2",
+        "phpunit/phpunit": "^9.3",
         "psalm/plugin-phpunit": "^0.10.0",
         "symfony/console": "^2.0.5|^3.0|^4.0|^5.0",
         "vimeo/psalm": "^3.11.4"