Update tslib to version 2.5.0

Author: depfu[bot]

front-end/package-lock.json

@@ -33,7 +33,7 @@
     "node-forge": ">=1.3.0",
     "rxjs": "^6.6.0",
     "shelljs": ">=0.8.5",
-    "tslib": "^2.0.0",
+    "tslib": "^2.5.0",
     "zone.js": "~0.11.4"
   },
   "devDependencies": {