Update dependency @angular/core to v20 [SECURITY]

Author: renovate[bot]

angular-client/package.json

@@ -20,7 +20,7 @@
     "@angular/cdk": "~7.1.0",
     "@angular/common": "~7.1.0",
     "@angular/compiler": "~7.1.0",
-    "@angular/core": "~7.2.0",
+    "@angular/core": "~20.1.0",
     "@angular/forms": "^7.0.4",
     "@angular/http": "~7.2.0",
     "@angular/material": "^7.0.4",