chore: some fix and improvements

[Nymphxyz]

Hi, I did some fix and changes, not sure if you are still maintaining this repo, because I haven't see any activities since Jun.

I'm happy to explain the details of my changes if you are still maintaining this project.

[liunn123]

sshj upgrade to 0.36.0 Package the program as a jar The error message will be as follows X25519 unsupported public key length Have you ever encountered it? Could you please give me some guidance