Update guava from 29.0-jre to 31.0.1-jre due to 3rd party vulnerability issue CVE-2020-8908

Current Situation

• Currently JobScheduler engine uses guava version 29.0-jre
• a vulnerability affects this version,
  • see https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-8908

Desired Behavior

• Due to a vulnerability Issue of older guava releases the JobScheduler engine should use the current version > 30.0-jre that fixes the issues.