Bump ember-cli to 6.9 in the 6.9 release

Author: NullVoxPopuli

files/package.json

@@ -72,7 +72,7 @@
     "concurrently": "^9.2.1",
     "decorator-transforms": "^2.3.0",
     "ember-auto-import": "^2.12.0",
-    "ember-cli": "~6.8.0",
+    "ember-cli": "~6.9.0",
     "ember-cli-babel": "^8.2.0",
     "ember-cli-deprecation-workflow": "^3.4.0<% if (emberData) { %>",
     "ember-data": "~5.6.0<% } %>",