[improve] aes256-cbc is not implemented in openssh-key-v1 with ed25519 key

[nasatome]

I use DBeaver and when using the SSHJ plugin it throws me the following error:

Cannot establish tunnel
  Cipher 'aes256-cbc' not currently implemented for openssh-key-v1 format

this issue had previously been closed:
#427
But I think in an incomplete way (I just think so)

dbeaver/dbeaver#4585