Update JCraft JSch version to 0.1.55 due to 3rd party vulnerability issues (CVE-2016-5725)

Current Situation

• Currently JobScheduler uses JCraft JSch version 0.1.53
• A vulnerability affects this version, see https://nvd.nist.gov/vuln/detail/CVE-2016-5725
• The JobScheduler is not affected by the vulnerability

Desired Behavior

• Due to the vulnerability Issue of the JCraft JSch release and the bugfixes provided with the current JSch version the JobScheduler should use the current version 0.1.55.