deps(misc): bump ember-source from 5.6.0 to 5.12.0

Bumps [ember-source](https://github.com/emberjs/ember.js) from 5.6.0 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@v5.6.0...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

@@ -98,7 +98,7 @@
     "ember-page-title": "^8.2.2",
     "ember-qunit": "^8.0.2",
     "ember-resolver": "^11.0.1",
-    "ember-source": "~5.6.0",
+    "ember-source": "~5.12.0",
     "ember-source-channel-url": "^3.0.0",
     "ember-template-lint": "^5.13.0",
     "ember-tooltips": "^3.6.0",