chore(deps): bump bn.js and @types/bn.js

Bumps [bn.js](https://github.com/indutny/bn.js) and [@types/bn.js](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/bn.js). These dependencies needed to be updated together.

Updates `bn.js` from 5.2.1 to 5.2.2
- [Release notes](https://github.com/indutny/bn.js/releases)
- [Changelog](https://github.com/indutny/bn.js/blob/master/CHANGELOG.md)
- [Commits](indutny/bn.js@v5.2.1...v5.2.2)

Updates `@types/bn.js` from 5.1.6 to 5.2.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/bn.js)

---
updated-dependencies:
- dependency-name: bn.js
  dependency-version: 5.2.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: "@types/bn.js"
  dependency-version: 5.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]