chore(deps): update dependency @angular-devkit/build-angular to v21

Author: renovate[bot]

package.json

@@ -63,7 +63,7 @@
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-prettier": "^5.5.4",
     "@analogjs/vite-plugin-angular": "^2.0.0",
-    "@angular-devkit/build-angular": "~20.2.0",
+    "@angular-devkit/build-angular": "~21.0.0",
     "@angular/common": "~20.3.0",
     "@angular/compiler": "~20.3.0",
     "@angular/compiler-cli": "~20.3.0",