chore: replace unmaintained eslint-plugin-node with eslint-plugin-n

[stefanosala]

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

---

Ref: #4824

I was exploring the hardhat repo and thought about picking a couple of low hanging fruits to get to know the repository and the team :) this one seemed to be quite straightforward? Do you need me to update anything else?

Thanks!
Stefano

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 9, 2024 7:01pm

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[stefanosala]

Happy to see a progress here, thanks @alcuadrado :)

[alcuadrado]

Sorry it took so long. I'll merge it as soon as the ci passes.

[stefanosala]

No worries! It was my effort in trying to get used to the code / repo as quickly as possible back when I was in the process of interviewing with Nomic :)