Update dependency ember-source to v6 (#99)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -64,7 +64,7 @@
     "ember-page-title": "9.0.3",
     "ember-qunit": "8.1.0",
     "ember-resolver": "13.1.1",
-    "ember-source": "5.12.0",
+    "ember-source": "6.7.0",
     "ember-source-channel-url": "3.0.0",
     "ember-template-lint": "6.1.0",
     "ember-try": "3.0.0",