chore(deps): update angular-cli monorepo to v21

Author: renovate[bot]

packages/webapp/package.json

@@ -29,8 +29,8 @@
     "zone.js": "~0.15.0"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^18.0.0",
-    "@angular/cli": "~18.2.0",
+    "@angular-devkit/build-angular": "^21.0.0",
+    "@angular/cli": "~21.2.0",
     "@angular/compiler-cli": "^18.0.0",
     "@types/jasmine": "~5.1.4",
     "autoprefixer": "^10.4.17",