Bump @angular/cdk from 8.2.3 to 21.0.3 in /admin-ui

Bumps [@angular/cdk](https://github.com/angular/components) from 8.2.3 to 21.0.3.
- [Release notes](https://github.com/angular/components/releases)
- [Changelog](https://github.com/angular/components/blob/main/CHANGELOG.md)
- [Commits](angular/components@8.2.3...v21.0.3)

---
updated-dependencies:
- dependency-name: "@angular/cdk"
  dependency-version: 21.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

admin-ui/package-lock.json

@@ -13,7 +13,7 @@
   "private": true,
   "dependencies": {
     "@angular/animations": "^8.2.14",
-    "@angular/cdk": "^8.2.3",
+    "@angular/cdk": "^21.0.3",
     "@angular/common": "^8.0.3",
     "@angular/compiler": "^8.0.3",
     "@angular/core": "^8.0.3",