no deprecations (support php 8.1)

Author: matkomat

generate.php

@@ -445,7 +445,7 @@ private function processDynamicObjectType(string $domain, $typeSpec)
 		$fromJson->addBody("return new static(\$rawData);");
 		$fromJson->addComment("@param object \$rawData");
 
-		$jsonSerialize = $objectClass->addMethod("jsonSerialize");
+		$jsonSerialize = $objectClass->addMethod("jsonSerialize")->addAttribute('ReturnTypeWillChange');
 		$jsonSerialize->addBody("return \$this->rawData;");
 
 		$objectClass->addMethod("getRawData")
@@ -520,7 +520,7 @@ private function processObjectType(string $domain, $typeSpec, bool $withBuilder
 		$fromJson->addComment("@param object \$data");
 		$fromJson->addComment("@return static");
 
-		$jsonSerialize = $objectClass->addMethod("jsonSerialize");
+		$jsonSerialize = $objectClass->addMethod("jsonSerialize")->addAttribute('ReturnTypeWillChange');
 		$jsonSerialize->addBody("\$data = new \\stdClass();");
 
 		$builderClass = null;