Updated pom.xml by upgrading the jsch plugin to V0.1.55

[dev-medha-io]

JENKINS-56031 - SSH plugin fails intermittently because of issue with JSch plugin
Upgrading to latest version of Jsch (v0.1.55) which fixes the underlying issue.

[jeffret-b]

@jvz Could you review also?

[jeffret-b]

@ljader, just pinging you hoping you'll see this. This PR is a follow-on to earlier work I did in releasing the jsch plugin version 0.1.55. I think it would be good to incorporate this change into the ssh-plugin. It should easily take care of issues some people have seen.

[oleg-nenashev]

@ljader Hi, are you still interested in maintaining this plugin? If not, would it be fine if I put it for adoption?

[monksy]

So jch the official version doesn't support private newer private key files and it also tries to force the usage of ssh-rsa from the public key. (No longer supported anymore )

New recommended approach: Theres a fork of jsch. JSch is wildly abandonware at the moment:

https://github.com/mwiede/jsch

From the fork

As of the 0.2.0 release, the RSA/SHA1 signature algorithm is disabled by default.

SHA1 is no longer considered secure by the general cryptographic community and this JSch fork strives to maintain secure choices for default algorithms that it will utilize.
This also follows the lead of the OpenSSH project in which they disabled RSA/SHA1 signatures by default as of [OpenSSH release 8.8](https://www.openssh.com/txt/release-8.8).

@jvz

[ptsneves]

Any reason this is not merged?