cababfebac
As shown in [0] the markdownlint job is currently broken, as the ensure-nodejs role still defaults to node_version 6, which is severly outdated and no longer installable on our current default Ubuntu 22.04 nodes. Pin to the latest LTS node version, 18. [0] https://review.opendev.org/c/opendev/sandbox/+/618075 Change-Id: I864587f1fd6d32dc5e744fb3cf00e13485cba326