🛠️ Repo: Migrate ESLint to v9

[markEHVN]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

ESLint V9 is official. https://eslint.org/docs/latest/use/migrate-to-9.0.0
Migrate ESLint v8 to ESLint v9

Additional Info

No response

[JoshuaKGoldberg]

Heh, sure, go ahead if you want. https://github.com/JoshuaKGoldberg/create-typescript-app now generates an ESLint 9 config you can use as reference: https://github.com/JoshuaKGoldberg/object-strings-deep/blob/41390065d3fa1f06d34bd2ed7d7c0320d8227ec6/eslint.config.js

I just haven't updated this repo or other older ones yet because I generally do a large sweep of repos a few times a year to update them to the latest CTA template. Per JoshuaKGoldberg/create-typescript-app#1181, that's going to be a lot easier once they're all onboarded to https://github.com/JoshuaKGoldberg/create within the next few months.

[markEHVN]

Like, let me update PR follow create-typescript-app.
Waiting https://github.com/JoshuaKGoldberg/create ❤️

[JoshuaKGoldberg]

@all-contributors please add @markEHVN for tool.

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[allcontributors]

@JoshuaKGoldberg

I've put up a pull request to add @markEHVN! 🎉