fix: Update getAuthToken for ES6 modules

[focusaurus]

Impact: minor
Type: bugfix|chore

Issue

The bin/token script printed a bunch of confusing ES6 warnings to stderr:

(node:100531) Warning: require() of ES modules is not supported.
require() of .reaction/getAuthToken.js is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename getAuthToken.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from package.json.

Solution

Update to modern import javascript syntax.

Breaking changes

None

Testing

1. Run the script with a userid command line argument. If no warnings, all's good.