taskcluster/docker-worker 2 pull requests

• Bug 1490964 - tighten docker-worker payload schema Sep 13
• Bug 1491022 - Upgrade to docker-exec-websocket-server with newer lodash Sep 19

taskcluster/iid-verify 1 pull request

• Bug 1490975 - Make supported Node version >=8.12.0 the minimum suppor… Sep 13