chore: update NodeJS post-processor to use MOSS approved images and update node version for tests#771

gcf-owl-bot[bot] wants to merge 6 commits intomaingoogleapis/nodejs-logging-bunyan:mainfrom

owl-bot-update-lock-da69f1fd77b825b0520b1b0a047c270a3f7e3a42e4d46a5321376281cef6e62bgoogleapis/nodejs-logging-bunyan:owl-bot-update-lock-da69f1fd77b825b0520b1b0a047c270a3f7e3a42e4d46a5321376281cef6e62bCopy head branch name to clipboard