chore(deps-dev): bump ember-math-helpers from 2.11.1 to 2.12.1

Bumps [ember-math-helpers](https://github.com/shipshapecode/ember-math-helpers) from 2.11.1 to 2.12.1.
- [Release notes](https://github.com/shipshapecode/ember-math-helpers/releases)
- [Changelog](https://github.com/shipshapecode/ember-math-helpers/blob/master/CHANGELOG.md)
- [Commits](RobbieTheWagner/ember-math-helpers@v2.11.1...v2.12.1)

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

package.json

@@ -90,7 +90,7 @@
     "ember-l10n": "^3.1.1",
     "ember-link-action": "0.1.3",
     "ember-load-initializers": "^2.0.0",
-    "ember-math-helpers": "^2.11.1",
+    "ember-math-helpers": "^2.12.1",
     "ember-maybe-import-regenerator": "^0.1.6",
     "ember-metrics": "poteto/ember-metrics#87f24d2",
     "ember-models-table": "^2.10.1",