Exclude E_DEPRECATED from error_reporting

This error is filtered in https://github.com/phpstan/phpstan-src/blob/5797c27e0d7e943b67b717f023e2ac2fd8a25140/src/Analyser/FileAnalyser.php#L329
anyway. But it might still be seen when the deprecation is triggered by one of autoload.files
in included Composer autoloaders.

bin/phpstan

@@ -11,7 +11,7 @@ use PHPStan\Internal\ComposerHelper;
 use Symfony\Component\Console\Helper\ProgressBar;
 
 (function () {
-	error_reporting(E_ALL);
+	error_reporting(E_ALL & ~E_DEPRECATED);
 	ini_set('display_errors', 'stderr');
 	if (version_compare(PHP_VERSION, '7.4.0', '<')) {
 		// PHP earlier than 7.4.x with OpCache triggers a bug when we intercept