chore(deps-dev): bump ember-notify from 6.0.3 to 6.0.4 in /frontend

Bumps [ember-notify](https://github.com/adopted-ember-addons/ember-notify) from 6.0.3 to 6.0.4.
- [Release notes](https://github.com/adopted-ember-addons/ember-notify/releases)
- [Changelog](https://github.com/adopted-ember-addons/ember-notify/blob/master/CHANGELOG.md)
- [Commits](https://github.com/adopted-ember-addons/ember-notify/commits)

---
updated-dependencies:
- dependency-name: ember-notify
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package.json

@@ -79,7 +79,7 @@
     "ember-load-initializers": "2.1.2",
     "ember-math-helpers": "2.18.2",
     "ember-moment": "9.0.1",
-    "ember-notify": "6.0.3",
+    "ember-notify": "6.0.4",
     "ember-pad": "1.2.3",
     "ember-page-title": "7.0.0",
     "ember-power-calendar": "0.18.0",