Bump ember-cli from 4.12.3 to 6.7.2

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 4.12.3 to 6.7.2.
- [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: 6.7.2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -91,7 +91,7 @@
     "@typescript-eslint/parser": "^4.0.0",
     "babel-eslint": "^10.1.0",
     "broccoli-asset-rev": "^3.0.0",
-    "ember-cli": "^4.0.1",
+    "ember-cli": "^6.7.2",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-github-pages": "^0.2.2",
     "ember-cli-inject-live-reload": "^2.1.0",