Merge branch 'ashmckenzie/bump-node-js-version' into 'master'

Update required Node.js version to 14.17.5

See merge request gitlab-org/gitlab!74574

.nvmrc

-14.15.4
+14.17.5

.tool-versions

-nodejs 14.15.4
+nodejs 14.17.5
 ruby 2.7.4
 yarn 1.22.11