Bump ember-cli-clean-css from 2.0.1 to 3.0.0 (#85)

Bumps [ember-cli-clean-css](https://github.com/ember-cli/ember-cli-clean-css) from 2.0.1 to 3.0.0.
- [Release notes](https://github.com/ember-cli/ember-cli-clean-css/releases)
- [Changelog](https://github.com/ember-cli/ember-cli-clean-css/blob/main/CHANGELOG.md)
- [Commits](ember-cli/ember-cli-clean-css@v2.0.1...v3.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pnpm-lock.yaml

@@ -55,7 +55,7 @@
     "ember-cli": "~5.10.0",
     "ember-cli-app-version": "^7.0.0",
     "ember-cli-babel": "^8.2.0",
-    "ember-cli-clean-css": "^2.0.0",
+    "ember-cli-clean-css": "^3.0.0",
     "ember-cli-dependency-checker": "^3.3.2",
     "ember-cli-htmlbars": "^6.3.0",
     "ember-cli-inject-live-reload": "^2.1.0",