Possible Error on public function getItemsByTag

[GeoSot]

https://github.com/PHPSocialNetwork/phpfastcache/blob/97fa80607c0c911ea403ab18f222099199129f68/lib/Phpfastcache/Core/Pool/TaggableCacheItemPoolTrait.php#L168

[github-actions]

Hello curious contributor !
Since it seems to be your first contribution, make sure that you've been:

• Reading and searching out our WIKI
• Reading and agreed with our Code Of Conduct
• Reading and understood our Coding Guideline
• Reading our README
  If everything looks unclear to you, tell us what 😄
  The Phpfastcache Team

[Geolim4]

Fixed in #772 :)