Merge pull request #415 from brutto/main

Fix deprecation error on php 8.1

src/Stash/Driver/Sub/Memcached.php

@@ -186,7 +186,7 @@ public function get($key)
      */
     public function cas($key, $value)
     {
-        $token = null;
+        $token = 0;
         if (($rValue = $this->memcached->get($key, null, $token)) !== false) {
             return $rValue;
         }