chore(deps): update dependency ember-source to v6.7.0 (#510)

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

Author: renovate[bot]

package.json

@@ -59,7 +59,7 @@
       "ember-cli-babel": "^8.2.0",
       "ember-element-helper": ">= 0.8.6",
       "reactiveweb": "^1.8.0",
-      "ember-source": "6.5.0",
+      "ember-source": "6.7.0",
       "tracked-toolbox": "^2.0.0"
     },
     "packageExtensions": {