Update dependency ember-cli to v6

Author: renovate[bot]

package.json

@@ -39,7 +39,7 @@
     "broccoli-asset-rev": "3.0.0",
     "concurrently": "8.2.2",
     "ember-auto-import": "2.10.0",
-    "ember-cli": "5.12.0",
+    "ember-cli": "6.7.0",
     "ember-cli-dependency-checker": "3.3.3",
     "ember-cli-inject-live-reload": "2.1.0",
     "ember-cli-sri": "2.1.1",