Update facade docblocks

Author: taylorotwell

src/Illuminate/Support/Facades/Cache.php

@@ -33,7 +33,7 @@
  * @method static mixed remember(string $key, \Closure|\DateTimeInterface|\DateInterval|int|null $ttl, \Closure $callback)
  * @method static mixed sear(string $key, \Closure $callback)
  * @method static mixed rememberForever(string $key, \Closure $callback)
- * @method static mixed flexible(string $key, array $ttl, callable $callback, array|null $lock = null)
+ * @method static mixed flexible(string $key, array $ttl, callable $callback, array|null $lock = null, bool $alwaysDefer = false)
  * @method static bool forget(string $key)
  * @method static bool delete(string $key)
  * @method static bool deleteMultiple(iterable $keys)