Update dependency ember-cli to v6

Author: renovate[bot]

ember/package.json

@@ -43,7 +43,7 @@
     "ember-ajax": "5.0.0",
     "ember-auto-import": "1.11.2",
     "ember-bootstrap": "4.3.0",
-    "ember-cli": "3.26.0",
+    "ember-cli": "6.2.3",
     "ember-cli-babel": "7.26.6",
     "ember-cli-bundle-analyzer": "0.2.2",
     "ember-cli-code-coverage": "1.0.2",