Bump ember-source from 3.12.2 to 3.22.0

Bumps [ember-source](https://github.com/emberjs/ember.js) from 3.12.2 to 3.22.0.
- [Release notes](https://github.com/emberjs/ember.js/releases)
- [Changelog](https://github.com/emberjs/ember.js/blob/master/CHANGELOG.md)
- [Commits](emberjs/ember.js@v3.12.2...v3.22.0)

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

Author: dependabot-preview[bot]

package.json

@@ -50,7 +50,7 @@
     "ember-maybe-import-regenerator": "^0.1.6",
     "ember-qunit": "^4.6.0",
     "ember-resolver": "^8.0.0",
-    "ember-source": "~3.12.0",
+    "ember-source": "~3.22.0",
     "ember-source-channel-url": "^3.0.0",
     "ember-template-lint": "^2.14.0",
     "ember-try": "^1.4.0",