feat(ember)!: Officially drop support for ember <=3.x (#15032)

Ref #14263

Author: Luca Forstner

docs/migration/v8-to-v9.md

@@ -45,7 +45,7 @@ Support for the following Framework versions is dropped:
 - **Remix**: Version `1.x`
 - **TanStack Router**: Version `1.63.0` and lower (relevant when using `tanstackRouterBrowserTracingIntegration`)
 - **SvelteKit**: SvelteKit version `1.x`
-- **Ember.js**: Ember.js version `3.x` and lower
+- **Ember.js**: Ember.js version `3.x` and lower (minimum supported version is `4.x`)
 
 ### TypeScript Version Policy
 

packages/ember/package.json

@@ -39,6 +39,14 @@
     "ember-cli-htmlbars": "^6.1.1",
     "ember-cli-typescript": "^5.3.0"
   },
+  "peerDependencies": {
+    "ember-cli": ">=4"
+  },
+  "peerDependenciesMeta": {
+    "ember-cli": {
+      "optional": true
+    }
+  },
   "devDependencies": {
     "@ember/optional-features": "~1.3.0",
     "@ember/test-helpers": "4.0.4",