fix(deps): update dependency tslib to v2.8.1

Author: renovate[bot]

Phonebook.Frontend/package-lock.json

@@ -61,7 +61,7 @@
     "ngx-vcard": "2.1.9",
     "raven-js": "3.27.2",
     "rxjs": "6.6.3",
-    "tslib": "2.0.0",
+    "tslib": "2.8.1",
     "uglify-es": "3.3.9",
     "zone.js": "0.11.3"
   },