Build(deps-dev): Bump ember-cli from 5.12.0 to 6.0.0 (#29728)

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 5.12.0 to 6.0.0.
- [Release notes](https://github.com/ember-cli/ember-cli/releases)
- [Changelog](https://github.com/ember-cli/ember-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ember-cli/ember-cli/compare/v5.12.0...v6.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

app/assets/javascripts/discourse-common/package.json

@@ -32,7 +32,7 @@
     "@types/qunit": "^2.19.12",
     "@types/rsvp": "^4.0.9",
     "broccoli-asset-rev": "^3.0.0",
-    "ember-cli": "~5.12.0",
+    "ember-cli": "~6.0.0",
     "ember-cli-inject-live-reload": "^2.1.0",
     "ember-cli-sri": "^2.1.1",
     "ember-cli-terser": "^4.0.2",