Build(deps): Bump ember-template-imports from 3.4.2 to 4.0.0 in /app/assets/javascripts (#23970)

* Build(deps): Bump ember-template-imports in /app/assets/javascripts

Bumps [ember-template-imports](https://github.com/ember-template-imports/ember-template-imports) from 3.4.2 to 4.0.0.
- [Release notes](https://github.com/ember-template-imports/ember-template-imports/releases)
- [Changelog](https://github.com/ember-template-imports/ember-template-imports/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ember-template-imports/ember-template-imports/compare/v3.4.2...v4.0.0)

---
updated-dependencies:
- dependency-name: ember-template-imports
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

* Remove legacy decorators from gjs file

---------

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

app/assets/javascripts/admin/package.json

@@ -18,7 +18,7 @@
     "ember-auto-import": "^2.6.3",
     "ember-cli-babel": "^8.2.0",
     "ember-cli-htmlbars": "^6.3.0",
-    "ember-template-imports": "^3.4.2"
+    "ember-template-imports": "^4.0.0"
   },
   "devDependencies": {
     "@babel/core": "^7.23.2",