Set @angular/aria to exact version 21.0.0

Changed the @angular/aria dependency version from a range (~21.0.0) to the exact version (21.0.0) in package.json for consistency with other Angular dependencies.

npm/ng-packs/package.json

@@ -56,7 +56,7 @@
     "@angular-eslint/eslint-plugin-template": "~21.0.0",
     "@angular-eslint/template-parser": "~21.0.0",
     "@angular/animations": "21.0.0",
-    "@angular/aria": "~21.0.0",
+    "@angular/aria": "21.0.0",
     "@angular/build": "~21.0.0",
     "@angular/cli": "~21.0.0",
     "@angular/common": "~21.0.0",