update gremlin to 3.6.2

[talr1]

Amazon Neptune Engine Version 1.2.1.0 (2023-03-08)

Gremlin earliest version supported: 3.6.2
Gremlin latest version supported: 3.6.2

which means 3.6.2 support is needed in this package in order to be able to use latest Neptune Engine

Edit 07/5/23: TinkerPop 3.6.3 (Release Date: May 1, 2023) is out