Rename cache lock key

Author: timacdonald

src/Illuminate/Cache/Repository.php

@@ -504,7 +504,7 @@ public function flexible($key, $ttl, $callback, $lock = null)
 
         $refresh = function () use ($key, $ttl, $callback, $lock, $created) {
             $this->store->lock(
-                "illuminate:cache:refresh:lock:{$key}",
+                "illuminate:cache:flexible:lock:{$key}",
                 $lock['seconds'] ?? 0,
                 $lock['owner'] ?? null,
             )->get(function () use ($key, $callback, $created, $ttl) {