support for PHP 8.3

Author: dg

preset-fixer/php83.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+$config = require __DIR__ . '/php82.php';
+
+$rules = [
+	'@PHP83Migration' => true,
+];
+
+$config->setRules($rules + $config->getRules());
+return $config;

preset-sniffer/php83.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0"?>
+<ruleset name="PHP 8.3" namespace="Nette">
+	<rule ref="./php82.xml"/>
+
+	<config name="php_version" value="80300"/>
+</ruleset>