build(deps): bump bn.js from 5.1.3 to 5.2.0 in /token-swap/js

Bumps [bn.js](https://github.com/indutny/bn.js) from 5.1.3 to 5.2.0.
- [Release notes](https://github.com/indutny/bn.js/releases)
- [Changelog](https://github.com/indutny/bn.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/indutny/bn.js/compare/v5.1.3...v5.2.0)

Signed-off-by: dependabot[bot] <support@github.com>

token-swap/js/package-lock.json

@@ -3882,9 +3882,9 @@
       "dev": true
     },
     "bn.js": {
-      "version": "5.1.3",
-      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.1.3.tgz",
-      "integrity": "sha512-GkTiFpjFtUzU9CbMeJ5iazkCzGL3jrhzerzZIuqLABjbwRaFt33I9tUdSNryIptM+RxDet6OKm2WnLXzW51KsQ=="
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.0.tgz",
+      "integrity": "sha512-D7iWRBvnZE8ecXiLj/9wbxH7Tk79fAh8IHaTNq1RWRixsS02W+5qS+iE9yq6RYl0asXx5tw0bLhmT5pIfbSquw=="
     },
     "boolbase": {
       "version": "1.0.0",