Upgrade ember-simple-auth to latest (#2573)

Upgrade ember-simple-auth to latest

* Change ember-auto-import from devDependencies to dependencies

addons/auth/package.json

@@ -21,9 +21,10 @@
     "doc:toc": "doctoc README.md"
   },
   "dependencies": {
+    "ember-auto-import": "2.8.1",
     "ember-cli-babel": "^8.2.0",
     "ember-cli-htmlbars": "^6.2.0",
-    "ember-simple-auth": "^4.2.2"
+    "ember-simple-auth": "^6.1.0"
   },
   "devDependencies": {
     "@babel/eslint-parser": "^7.21.3",
@@ -38,7 +39,6 @@
     "broccoli-asset-rev": "^3.0.0",
     "concurrently": "^9.1.0",
     "doctoc": "^2.2.0",
-    "ember-auto-import": "^2.8.1",
     "ember-cli": "^5.12.0",
     "ember-cli-dependency-checker": "^3.3.2",
     "ember-cli-inject-live-reload": "^2.1.0",