Update sbt-assembly version in slave-sbt image

While the sbt-assembly version (0.14.5) used in the slave-sbt image
is compatible with the current sbt-version, 0.14.6 is already
released for a while now.

This change updates the sbt-assembly version to 0.14.6 to keep up
with releases.

Change-Id: I2229bf776d07f75d055e91fcddb4707ac1c69e8f
1 file changed
tree: 03685de52a3a53ffefdb27add4595841e4abd109
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore