chore(deps-dev): bump ember-qunit from 5.1.5 to 7.0.0 in /frontend

Bumps [ember-qunit](https://github.com/emberjs/ember-qunit) from 5.1.5 to 7.0.0.
- [Release notes](https://github.com/emberjs/ember-qunit/releases)
- [Changelog](https://github.com/emberjs/ember-qunit/blob/v7.0.0/CHANGELOG.md)
- [Commits](emberjs/ember-qunit@v5.1.5...v7.0.0)

---
updated-dependencies:
- dependency-name: ember-qunit
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

frontend/package.json

@@ -78,7 +78,7 @@
  "ember-moment": "9.0.1",
  "ember-notify": "^6.0.0",
  "ember-page-title": "^7.0.0",
- "ember-qunit": "^5.1.4",
+ "ember-qunit": "^7.0.0",
  "ember-resolver": "^8.0.2",
  "ember-simple-auth": "4.2.2",
  "ember-simple-auth-oidc": "^3.0.1",