Gravy has been replaced with a new plugin called Graves. With Graves, when you die your items will be place in a chest and the location of it will be told to you.
You are required to build and carry with you a respawn token in order for a grave to be created, otherwise your items will drop as they would normally.
You have 3 hours to find it before it vanishes!
More information here : https://www.scg.wtf/jb/d/6711-graves-where-do-our-items-go-when-we-die