Remove unused variable nextId from updating arrays in state lesson

[kprakhar]

Issue: In Updating Arrays in State lesson in one of the code example there is a unused variable called nextId.

Fix: As it's not required, I've removed it.

Before:

After:

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Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

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[BartoszKlonowski]

Hello @kprakhar!
Thank you for creating the PR, however, there was a PR with the fix already linked to this issue.
Let me close this PR as it is a duplicate of #6470 already merged and issue is already closed.