Update dependency ember-source to v6

Author: renovate[bot]

package.json

@@ -77,7 +77,7 @@
     "ember-load-initializers": "2.1.2",
     "ember-qunit": "8.1.1",
     "ember-resolver": "11.0.1",
-    "ember-source": "5.12.0",
+    "ember-source": "6.5.0",
     "ember-source-channel-url": "3.0.0",
     "ember-template-lint": "7.9.0",
     "ember-try": "3.0.0",