Bump ember-fetch from 6.5.1 to 7.0.0

Bumps [ember-fetch](https://github.com/ember-cli/ember-fetch) from 6.5.1 to 7.0.0.
- [Release notes](https://github.com/ember-cli/ember-fetch/releases)
- [Changelog](https://github.com/ember-cli/ember-fetch/blob/master/CHANGELOG.md)
- [Commits](ember-cli/ember-fetch@v6.5.1...v7.0.0)

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

Author: dependabot-preview[bot]