tools: update ESLint to v9 and use flat config

Closes: nodejs#52567 PR-URL: nodejs#52780 Fixes: nodejs#52567 Reviewed-By: Moshe Atlow <[email protected]> Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]>
bmeck · Jun 22, 2024 · c82f7e2 · c82f7e2
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diff --git a/.eslintignore b/.eslintignore
diff --git a/.eslintrc.js b/.eslintrc.js