PhpsecServer: add support for using a RSA key (dg#137)

keys generated by `ssh-keygen -t rsa` are working (with and without passphrase)

src/Deployment/PhpsecServer.php

@@ -141,7 +141,6 @@ public function getDir(): string
 		return isset($this->url['path']) ? rtrim($this->url['path'], '/') : '';
 	}
 
-
 	public function execute(string $command): string
 	{
 		return $this->sftp->exec($command);