Update dependency ember-source to v5.6.0 (#417)

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

Author: renovate[bot]

package.json

@@ -51,7 +51,7 @@
     "ember-page-title": "7.0.0",
     "ember-qunit": "8.0.2",
     "ember-resolver": "10.1.1",
-    "ember-source": "5.5.0",
+    "ember-source": "5.6.0",
     "ember-template-lint": "5.13.0",
     "ember-try": "2.0.0",
     "eslint": "7.32.0",