PHP 8.5: Prevent deprecation notices for imagedestroy

`imagedestroy` is deprecated in PHP 8.5+, and hasn't been doing anything since PHP 8.0.

To prevent deprecation warnings it should therefore be called on older versions of PHP only.

See https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_no-op_functions_from_the_resource_to_object_conversion.

Author: TobiasBg

src/PhpSpreadsheet/Worksheet/MemoryDrawing.php

@@ -65,7 +65,9 @@ public function __construct()
     public function __destruct()
     {
         if ($this->imageResource) {
-            @imagedestroy($this->imageResource);
+            if (\PHP_VERSION_ID < 80000) {
+                @imagedestroy($this->imageResource);
+            }
             $this->imageResource = null;
         }
         $this->worksheet = null;