chore(deps): update dependency @angular/cdk to v21

Author: renovate[bot]

package.json

@@ -147,7 +147,7 @@
   },
   "homepage": "https://github.com/esm-bundle/angular__cdk#readme",
   "devDependencies": {
-    "@angular/cdk": "15.2.9",
+    "@angular/cdk": "21.2.6",
     "@angular/common": "19.2.20",
     "@angular/compiler": "19.2.20",
     "@angular/compiler-cli": "19.2.20",