Bump WCT to 6.8.0

Because of the transitive deps, the v6.8.0 is the minimal
required by our builds.

Change-Id: I19cb9a36e3fdcba947a82f42204fe3721b1286d9
2 files changed
tree: 7ebbb16ac077ab336d0d81145c899a40cfb9a2ee
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore