Build(deps-dev): Bump ember-modifier from 4.1.0 to 4.2.0 (#27717)

Bumps [ember-modifier](https://github.com/ember-modifier/ember-modifier) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/ember-modifier/ember-modifier/releases)
- [Changelog](https://github.com/ember-modifier/ember-modifier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/ember-modifier/ember-modifier/compare/v4.1.0...v4.2.0)

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

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

app/assets/javascripts/discourse/package.json

@@ -91,7 +91,7 @@
     "ember-decorators": "^6.1.1",
     "ember-exam": "^9.0.0",
     "ember-load-initializers": "^2.1.1",
-    "ember-modifier": "^4.1.0",
+    "ember-modifier": "^4.2.0",
     "ember-on-resize-modifier": "^2.0.2",
     "ember-production-deprecations": "1.0.0",
     "ember-qunit": "^8.1.0",