build(deps-dev): bump ember-cli from 3.20.2 to 6.0.1

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 3.20.2 to 6.0.1.
- [Release notes](https://github.com/ember-cli/ember-cli/releases)
- [Changelog](https://github.com/ember-cli/ember-cli/blob/master/CHANGELOG.md)
- [Commits](ember-cli/ember-cli@v3.20.2...v6.0.1)

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

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

package.json

@@ -38,7 +38,7 @@
     "@glimmer/tracking": "^1.0.0",
     "babel-eslint": "^10.1.0",
     "broccoli-asset-rev": "^3.0.0",
-    "ember-cli": "~3.20.2",
+    "ember-cli": "~6.0.1",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-github-pages": "^0.2.1",
     "ember-cli-inject-live-reload": "^2.0.2",