Update angular-cli monorepo to v21

Author: renovate[bot]

package.json

@@ -35,8 +35,8 @@
         "@angular-eslint/eslint-plugin-template": "20.7.0",
         "@angular-eslint/schematics": "20.7.0",
         "@angular-eslint/template-parser": "20.7.0",
-        "@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",