build(deps-dev): Bump ember-source from 6.6.0 to 6.8.0 (#2316)

Bumps [ember-source](https://github.com/emberjs/ember.js) from 6.6.0 to 6.8.0.
- [Release notes](https://github.com/emberjs/ember.js/releases)
- [Changelog](https://github.com/emberjs/ember.js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/emberjs/ember.js/commits)

---
updated-dependencies:
- dependency-name: ember-source
  dependency-version: 6.8.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

ember-math-helpers/package.json

@@ -70,7 +70,7 @@
     "@types/rsvp": "^4.0.9",
     "babel-plugin-ember-template-compilation": "^2.2.5",
     "concurrently": "^9.2.1",
-    "ember-source": "^6.6.0",
+    "ember-source": "^6.8.0",
     "ember-template-lint": "^7.9.3",
     "eslint": "^9.34.0",
     "eslint-config-prettier": "^10.1.8",