pyxenon deps versions generally inconsistent with other code snippets

[jspaaks]

https://github.com/xenon-middleware/xenon-grpc/blob/d928011d660553d931cb7ed20ad8fc68934f3a4b/build.gradle#L33-L34

[jspaaks]

fixed for now https://github.com/xenon-middleware/xenon-grpc/releases/tag/v3.0.1