Bump i18n-js from 3.9.2 to 4.0.0

Bumps [i18n-js](https://github.com/fnando/i18n-js) from 3.9.2 to 4.0.0.
- [Release notes](https://github.com/fnando/i18n-js/releases)
- [Changelog](https://github.com/fnando/i18n-js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/fnando/i18n-js/compare/v3.9.2...v4.0.0)

---
updated-dependencies:
- dependency-name: i18n-js
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -14,7 +14,7 @@ gem 'faraday-net_http_persistent'
 gem 'faye-websocket'
 gem 'forgery'
 gem 'highline'
-gem 'i18n-js', '< 4.0.0'
+gem 'i18n-js'
 gem 'ims-lti', '< 2.0.0'
 gem 'jbuilder'
 gem 'json_schemer'