Update dependency ember-cli to v6

Author: renovate[bot]

package.json

@@ -47,7 +47,7 @@
     "concurrently": "9.2.1",
     "ember-auto-import": "2.10.0",
     "ember-bootstrap": "5.1.1",
-    "ember-cli": "4.12.3",
+    "ember-cli": "6.7.0",
     "ember-cli-blueprint-test-helpers": "0.19.2",
     "ember-cli-dependency-checker": "3.3.3",
     "ember-cli-inject-live-reload": "2.1.0",