Update dependency ember-source to ~5.6.0 (#222)

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

Author: renovate[bot]

package.json

@@ -107,7 +107,7 @@
     "ember-page-title": "^8.1.0",
     "ember-qunit": "^7.0.0",
     "ember-resolver": "^11.0.1",
-    "ember-source": "~5.5.0",
+    "ember-source": "~5.6.0",
     "ember-source-channel-url": "^3.0.0",
     "ember-template-imports": "^4.0.0",
     "ember-template-lint": "^5.13.0",