fix(deps): update dependency @angular/core to v21.2.4 [security]

Author: renovate[bot]

apps/demos/package.json

@@ -21,7 +21,7 @@
         "@angular/common": "~21.1.0",
         "@angular/compiler": "~21.1.0",
         "@angular/compiler-cli": "~21.1.0",
-        "@angular/core": "~21.1.0",
+        "@angular/core": "~21.2.0",
         "@angular/forms": "~21.1.0",
         "@angular/platform-browser": "~21.1.0",
         "@angular/platform-browser-dynamic": "~21.1.0",