Update angular-cli monorepo to v21

Author: renovate[bot]

package.json

@@ -33,8 +33,8 @@
     "@angular-eslint/eslint-plugin-template": "20.4.0",
     "@angular-eslint/schematics": "20.4.0",
     "@angular-eslint/template-parser": "20.4.0",
-    "@angular/build": "^20.0.5",
-    "@angular/cli": "~20.3.0",
+    "@angular/build": "^21.0.0",
+    "@angular/cli": "~21.2.0",
     "@angular/compiler-cli": "^20.0.6",
     "@eslint/eslintrc": "^3.1.0",
     "@eslint/js": "^9.11.1",