Updating npm dependencies and move to shrinkwrap to finally actually fix versions

Before starting: Have an non-updated moodle instance with all npm depdencies installed. Update your instance Run npm install Run grunt Verify no built files are changed Run npm outdated Verify no outdated packages are listed rm -R node_modules Run npm install Run grunt Verify no built files are changed Bonus test: rm -R node_modules rm npm-shrinkwrap.json npm install npm shrinkwrap --dev Compare the differences in the shrinkwrap (they should be minimal because we have very fixed package.json) Please read https://docs.moodle.org/dev/NPM#Updating_npm_dependencies and see if it would make sense to you for a future issue.