fix(deps): bump big.js from 6.2.0 to 6.2.1 (#25)

Bumps [big.js](https://github.com/MikeMcl/big.js) from 6.2.0 to 6.2.1.
- [Release notes](https://github.com/MikeMcl/big.js/releases)
- [Changelog](https://github.com/MikeMcl/big.js/blob/master/CHANGELOG.md)
- [Commits](MikeMcl/big.js@v6.2.0...v6.2.1)

---
updated-dependencies:
- dependency-name: big.js
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

yarn.lock

@@ -1472,9 +1472,9 @@ before-after-hook@^2.2.0:
   integrity sha512-3pZEU3NT5BFUo/AD5ERPWOgQOCZITni6iavr5AUw5AUwQjMlI0kzu5btnyD39AF0gUEsDPwJT+oY1ORBJijPjQ==
 
 big.js@^6.1.1:
-  version "6.2.0"
-  resolved "https://registry.yarnpkg.com/big.js/-/big.js-6.2.0.tgz#39c60822aecb0f34a1d79a90fe9908a0ddf45e1d"
-  integrity sha512-paIKvJiAaOYdLt6MfnvxkDo64lTOV257XYJyX3oJnJQocIclUn+48k6ZerH/c5FxWE6DGJu1TKDYis7tqHg9kg==
+  version "6.2.1"
+  resolved "https://registry.yarnpkg.com/big.js/-/big.js-6.2.1.tgz#7205ce763efb17c2e41f26f121c420c6a7c2744f"
+  integrity sha512-bCtHMwL9LeDIozFn+oNhhFoq+yQ3BNdnsLSASUxLciOb1vgvpHsIO1dsENiGMgbb4SkP5TrzWzRiLddn8ahVOQ==
 
 bin-links@^3.0.0:
   version "3.0.1"