fix: upgrade core-js from 3.6.4 to 3.6.5

Snyk has created this PR to upgrade core-js from 3.6.4 to 3.6.5.

See this package in NPM:
https://www.npmjs.com/package/core-js

See this project in Snyk:
https://app.snyk.io/org/hamzahamidi/project/e95b4ab5-5480-42e8-86fd-85a7f01be77d?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -79,7 +79,7 @@
     "@angular/platform-browser-dynamic": "^8.1.2",
     "@angular/router": "^8.1.2",
     "brace": "^0.11.1",
-    "core-js": "^3.6.4",
+    "core-js": "^3.6.5",
     "lodash-es": "^4.17.15",
     "rxjs": "^6.5.2",
     "zone.js": "~0.10.3"