build(deps-dev): bump ember-cli from 4.10.0 to 5.6.0

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 4.10.0 to 5.6.0.
- [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@v4.10.0...v5.6.0)

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

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

Author: dependabot[bot]