[php82] Suppress dynamic properties missing warning for PHP versions 8.2+. (#688)

Co-authored-by: Laurence Bahiirwa <[email protected]>

Author: bahiirwa

includes/entities/class-fs-site.php

@@ -13,6 +13,7 @@
     /**
      * @property int $blog_id
      */
+    #[AllowDynamicProperties]
     class FS_Site extends FS_Scope_Entity {
         /**
          * @var number