Deprecate `bosh_deployment_key_no_ecdsa`
Deprecate `bosh_deployment_key_no_ecdsa`

The key `nono` works just fine, thank you.
```
debug1: 7ebee69ed3534441e718234f83d8a3941c13cbfb@nono.io ED25519 SHA256:gKM3tY2vscqyuLs7EKJaPr3s/3Su+aXhPJ+pgxKHqLQ agent
debug2: we sent a publickey packet, wait for reply
debug1: 8e6d1264ed24074c3d5d5602ee81054c43fdca6d@nono.io ED25519 SHA256:gKM3tY2vscqyuLs7EKJaPr3s/3Su+aXhPJ+pgxKHqLQ agent
```

cunnie/bin,cunnie/bin,cunnie/bin,cunnie/bin,cunnie/bin,cunnie/bin,cunnie/bin