Update angular-cli monorepo to v21.2.6 (#486)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -26,7 +26,7 @@
   },
   "devDependencies": {
     "@angular/build": "^21.0.4",
-    "@angular/cli": "21.2.5",
+    "@angular/cli": "21.2.6",
     "@angular/compiler-cli": "21.2.6",
     "@types/file-saver": "2.0.7",
     "typescript": "5.9.3",