chore(deps-dev): bump ember-cli from 4.12.3 to 6.10.0

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 4.12.3 to 6.10.0.
- [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/commits)

---
updated-dependencies:
- dependency-name: ember-cli
  dependency-version: 6.10.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/ember/package.json

@@ -60,7 +60,7 @@
     "@types/rsvp": "~4.0.9",
     "babel-eslint": "~10.1.0",
     "broccoli-asset-rev": "~3.0.0",
-    "ember-cli": "~4.12.3",
+    "ember-cli": "~6.10.0",
     "ember-cli-dependency-checker": "~3.3.2",
     "ember-cli-inject-live-reload": "~2.1.0",
     "ember-cli-terser": "~4.0.2",