chore: update ESLint to v9

[fisker]

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[fisker]

Need update Branch protection rule when merge.

[JounQin]

Seems only housekeeping, but Node 14/16 compatible tests are disabled?

[fisker]

but Node 14/16 compatible tests are disabled?

ESLint can't run on them https://github.com/prettier/eslint-plugin-prettier/actions/runs/13699233561/job/38308655951#step:6:28 . Suggestion?

[JounQin]

but Node 14/16 compatible tests are disabled?

ESLint can't run on them prettier/eslint-plugin-prettier/actions/runs/13699233561/job/38308655951#step:6:28 . Suggestion?

We may need to downgrade eslint to v8 for Node 14/16 on CI?

eslint-plugin-prettier@5 is compatible with eslint v8/v9, so testing is still needed just like prettier itself?

https://github.com/prettier/prettier/blob/main/.github/workflows/prod-test.yml#L61

[fisker]

We may need to downgrade eslint to v8 for Node 14/16 on CI?

I can try, but do we have a plan to drop support? Since I didn't actually change the code, it should still work with ESLint 8, just not tested.

[JounQin]

I can try, but do we have a plan to drop support? Since I didn't actually change the code, it should still work with ESLint 8, just not tested.

Personally I'd follow prettier's strategy instead of eslint's.

What means when prettier changes its engines support, eslint-plugin-prettier will follow.

[fisker]

All tested.

[JounQin]

Thanks for your great work!