fix(package): update @angular/cdk to version 9.2.4

Closes #83

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
   },
   "dependencies": {
     "@angular/animations": "^7.2.15",
-    "@angular/cdk": "^7.2.0",
+    "@angular/cdk": "^9.2.4",
     "@angular/common": "^7.2.15",
     "@angular/core": "^7.2.15",
     "@angular/http": "^7.2.15",