chore(deps-dev): bump ember-source from 5.7.0 to 5.12.0

Bumps [ember-source](https://github.com/emberjs/ember.js) from 5.7.0 to 5.12.0.
- [Release notes](https://github.com/emberjs/ember.js/releases)
- [Changelog](https://github.com/emberjs/ember.js/blob/main/CHANGELOG.md)
- [Commits](emberjs/ember.js@v5.7.0...v5.12.0)

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

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

package.json

@@ -79,7 +79,7 @@
     "ember-load-initializers": "2.1.2",
     "ember-qunit": "8.1.0",
     "ember-resolver": "11.0.1",
-    "ember-source": "5.7.0",
+    "ember-source": "5.12.0",
     "ember-source-channel-url": "3.0.0",
     "ember-template-lint": "6.0.0",
     "ember-template-lint-plugin-prettier": "5.0.0",