Fix PHPStan 2.x errors

src/server/Server.php

@@ -30,6 +30,7 @@
 use raklib\utils\ExceptionTraceCleaner;
 use raklib\utils\InternetAddress;
 use function asort;
+use function assert;
 use function bin2hex;
 use function count;
 use function get_class;
@@ -214,6 +215,9 @@ private function receivePacket() : bool{
 		if($buffer === null){
 			return false; //no data
 		}
+		assert($addressIp !== null, "Can't be null if we got a buffer");
+		assert($addressPort !== null, "Can't be null if we got a buffer");
+
 		$len = strlen($buffer);
 
 		$this->receiveBytes += $len;

tools/proxy.php

@@ -170,6 +170,8 @@ function serverToClientRelay(ClientSession $client, ServerSocket $clientProxySoc
 				if($buffer === null || $buffer === ""){
 					continue;
 				}
+				assert($recvAddr !== null, "Can't be null if we got a buffer");
+				assert($recvPort !== null, "Can't be null if we got a buffer");
 				if(isset($clients[$recvAddr][$recvPort])){
 					$client = $clients[$recvAddr][$recvPort];
 					$client->setActive();