chore: upgrade core-js from 3.9.0 to 3.9.1 (#709)

Snyk has created this PR to upgrade core-js from 3.9.0 to 3.9.1.

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

See this project in Snyk:
https://app.snyk.io/org/surajpuvvada/project/553e7174-0e22-4c7f-aa2c-12ae5f5768b5?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -41,7 +41,7 @@
     "@types/d3-hierarchy": "^2.0.0",
     "@types/d3-transition": "1.1.5",
     "apollo-angular": "^2.4.0",
-    "core-js": "^3.9.0",
+    "core-js": "^3.9.1",
     "d3-array": "^2.11.0",
     "d3-axis": "^2.1.0",
     "d3-brush": "^1.1.6",