Bump broccoli-caching-writer from 3.0.3 to 3.1.0

Bumps [broccoli-caching-writer](https://github.com/ember-cli/broccoli-caching-writer) from 3.0.3 to 3.1.0.
- [Release notes](https://github.com/ember-cli/broccoli-caching-writer/releases)
- [Changelog](https://github.com/ember-cli/broccoli-caching-writer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ember-cli/broccoli-caching-writer/commits)

---
updated-dependencies:
- dependency-name: broccoli-caching-writer
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]