build: update engines field in package.json

This commit removes the `yarn` engine field. The `packageManager` version was previously removed, causing Renovate to pick up an outdated Yarn version. Additionally, Yarn Berry does not use this field, rendering it unnecessary.

Author: alan-agius4

package.json

@@ -32,7 +32,6 @@
   },
   "engines": {
     "node": "^18.19.1 || ^20.11.1 || >=22.0.0",
-    "yarn": ">=1.21.1 <2",
     "npm": "Please use yarn instead of NPM to install dependencies"
   },
   "author": "Angular Authors",