Build(deps): bump ember-fetch from 6.6.0 to 6.7.0
Build(deps): bump ember-fetch from 6.6.0 to 6.7.0

Bumps [ember-fetch](https://github.com/ember-cli/ember-fetch) from 6.6.0 to 6.7.0.
- [Release notes](https://github.com/ember-cli/ember-fetch/releases)
- [Changelog](https://github.com/ember-cli/ember-fetch/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ember-cli/ember-fetch/compare/v6.6.0...v6.7.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
simplabs/ember-simple-auth,simplabs/ember-simple-auth