fixed PHPStan build

tests/phpstan/configs/actual-problems.neon

@@ -3410,6 +3410,16 @@ parameters:
 			count: 1
 			path: ../../../src/pocketmine/network/mcpe/convert/RuntimeBlockMapping.php
 
+		-
+			message: "#^Method pocketmine\\\\network\\\\mcpe\\\\encryption\\\\EncryptionUtils\\:\\:generateKey\\(\\) should return string but returns string\\|false\\.$#"
+			count: 1
+			path: ../../../src/pocketmine/network/mcpe/encryption/EncryptionUtils.php
+
+		-
+			message: "#^Property pocketmine\\\\network\\\\mcpe\\\\encryption\\\\PrepareEncryptionTask\\:\\:\\$serverPrivateKey \\(string\\) does not accept string\\|null\\.$#"
+			count: 1
+			path: ../../../src/pocketmine/network/mcpe/encryption/PrepareEncryptionTask.php
+
 		-
 			message: "#^Property pocketmine\\\\network\\\\mcpe\\\\protocol\\\\AddActorPacket\\:\\:\\$metadata \\(array\\<int, array\\{int, mixed\\}\\>\\) does not accept array\\<int, mixed\\>\\.$#"
 			count: 1

tests/phpstan/stubs/phpasn1.stub

@@ -0,0 +1,22 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+class Integer
+{
+    /**
+     * @param int|string $value
+     */
+    public function __construct($value){}
+
+    /** @return int|string */
+    public function getContent(){}
+}