Update dependency ember-cli to v6

Author: renovate[bot]

package.json

@@ -52,7 +52,7 @@
     "ember-bootstrap": "5.1.1",
     "ember-changeset": "4.2.0",
     "ember-changeset-validations": "5.0.0",
-    "ember-cli": "4.12.3",
+    "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",