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

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:
https://github.com/hierynomus/sshj/issues/427
But I think in an incomplete way (I just think so)

https://github.com/dbeaver/dbeaver/issues/4585

