build(deps-dev): Bump @ember-data/model from 5.3.0 to 5.3.8

Bumps [@ember-data/model](https://github.com/emberjs/data/tree/HEAD/packages/model) from 5.3.0 to 5.3.8.
- [Release notes](https://github.com/emberjs/data/releases)
- [Changelog](https://github.com/emberjs/data/blob/v5.3.8/CHANGELOG.md)
- [Commits](https://github.com/emberjs/data/commits/v5.3.8/packages/model)

---
updated-dependencies:
- dependency-name: "@ember-data/model"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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