TS-website is not yet compatible with PHP 8

src/installer/pages/2.php

@@ -83,12 +83,13 @@ if(!empty($_POST["allow-metrics-checkbox"])) {
 
 <?php
 function checkRequirements() {
-    // PHP version - 7.2.0 minimum
+    // PHP version - 7.2.0 min, but older than 8.0
+    // ts3phpframework needs to release a version with https://git.io/JKlRx for PHP 8 support
     {
-        $result = PHP_VERSION_ID < 70200 ? 2 : 0;
+        $result = (PHP_VERSION_ID < 70200 || PHP_VERSION_ID > 80000) ? 2 : 0;
 
         showCheckResult(
-                "PHP 7.2.0+",
+                "PHP 7.2.0 - 7.4",
                 $result,
                 "Current PHP version: " . PHP_VERSION
         );