Upgrade maven to v3.6.1

Move to the standard Apache Maven distribution and install
the latest version for using in our builds.

Change-Id: I54e5baf36f0b9abb6aa6e79b27e161b39c1eed3f
2 files changed
tree: 9e0a59b8402300ce3973fae8f42718431e7a2d27
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore