fix: upgrade big-integer from 1.6.36 to 1.6.48 (#1762)

Snyk has created this PR to upgrade big-integer from 1.6.36 to 1.6.48.

See this package in npm:
https://www.npmjs.com/package/big-integer

See this project in Snyk:
https://app.snyk.io/org/kspearrin/project/09a0a751-762e-41c7-b174-6f5cbbfbb2c9?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -93,7 +93,7 @@
     "@microsoft/signalr-protocol-msgpack": "3.1.0",
     "angular2-toaster": "8.0.0",
     "angulartics2": "9.1.0",
-    "big-integer": "1.6.36",
+    "big-integer": "1.6.48",
     "browser-hrtime": "^1.1.8",
     "core-js": "2.6.2",
     "date-input-polyfill": "^2.14.0",