Update dependency core-js to v2.6.11

Author: renovate-bot

package-lock.json

@@ -27,7 +27,7 @@
     "@angular/platform-browser": "7.2.13",
     "@angular/platform-browser-dynamic": "7.2.13",
     "@angular/router": "7.2.13",
-    "core-js": "2.6.5",
+    "core-js": "2.6.11",
     "hammerjs": "2.0.8",
     "moment": "2.24.0",
     "rxjs": "6.4.0",