Bump bn.js in the npm_and_yarn group across 1 directory

Bumps the npm_and_yarn group with 1 update in the / directory: [bn.js](https://github.com/indutny/bn.js).


Updates `bn.js` from 4.12.0 to 4.12.3
- [Release notes](https://github.com/indutny/bn.js/releases)
- [Changelog](https://github.com/indutny/bn.js/blob/master/CHANGELOG.md)
- [Commits](indutny/bn.js@v4.12.0...v4.12.3)

---
updated-dependencies:
- dependency-name: bn.js
  dependency-version: 4.12.3
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

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

Author: dependabot[bot]