Update dependency ember-cli to v6.9.1 (#12491)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -85,7 +85,7 @@
     "broccoli-funnel": "3.0.8",
     "ember-a11y-testing": "7.1.3",
     "ember-auto-import": "2.12.0",
-    "ember-cli": "6.8.1",
+    "ember-cli": "6.9.1",
     "ember-cli-babel": "8.2.0",
     "ember-cli-bundle-analyzer": "1.0.0",
     "ember-cli-dependency-checker": "3.3.3",