Update angular-cli monorepo to v21

Author: renovate[bot]

package.json

@@ -31,8 +31,8 @@
     "@angular/common": "^18.0.2"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^18.0.3",
-    "@angular/cli": "^18.0.3",
+    "@angular-devkit/build-angular": "^21.0.0",
+    "@angular/cli": "^21.0.0",
     "@angular/compiler": "^18.0.2",
     "@angular/compiler-cli": "^18.0.2",
     "@angular/core": "^18.0.2",