Update BN.js dependecy to v5.2.1

[gregorfelkar]

This is not a Bug Report, Feature Request, or related to Documentation

• I have searched the existing issues

Is there an existing issue for this?

• I have searched the existing issues

What's up?

• Fix serious issue in .toString(16)

The hex encoding of some numbers is wrong. Since the string representation
is also used for interoperability between BigInt libraries, this bug is
causing a number modification when a BN.js number is converted into
another BigInt class, for example the BigNumber of ethers.js.

indutny/bn.js@042ab62

Currently it will install:

│ └─┬ web3-utils@1.7.3
│   ├── bn.js@4.12.0

Examples/References

No response

[plusminushalf]

Hey I am new to the repo, will this be a good first issue? If yes I would like to pick this up.

[luu-alex]

Thank you for this @gregorfelkar this looks serious and we'll update BN as soon as we can