chore(deps-dev): bump ember-math-helpers from 4.0.0 to 4.2.1

Bumps [ember-math-helpers](https://github.com/RobbieTheWagner/ember-math-helpers) from 4.0.0 to 4.2.1.
- [Release notes](https://github.com/RobbieTheWagner/ember-math-helpers/releases)
- [Changelog](https://github.com/RobbieTheWagner/ember-math-helpers/blob/main/CHANGELOG.md)
- [Commits](https://github.com/RobbieTheWagner/ember-math-helpers/commits)

---
updated-dependencies:
- dependency-name: ember-math-helpers
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -145,7 +145,7 @@
     "ember-keyboard": "^9.0.1",
     "ember-lifeline": "^7.0.0",
     "ember-load-initializers": "^3.0.1",
-    "ember-math-helpers": "^4.0.0",
+    "ember-math-helpers": "^4.2.1",
     "ember-modifier": "^4.2.0",
     "ember-page-title": "^8.2.3",
     "ember-qunit": "^8.1.0",