Update dependency ember-source to v6

Author: renovate[bot]

package.json

@@ -84,7 +84,7 @@
     "ember-qunit": "7.0.0",
     "ember-resolver": "11.0.1",
     "ember-sinon-qunit": "7.5.0",
-    "ember-source": "5.12.0",
+    "ember-source": "6.2.0",
     "ember-template-lint": "6.1.0",
     "ember-template-lint-plugin-prettier": "5.0.0",
     "ember-test-selectors": "6.0.0",