tools: remove no-return-await lint rule

sapphi-red · sapphi-red · commit 0d4caee2d689 · 2023-10-10T04:35:43.000+09:00
no-return-await rule was deprecated in ESLint 8.46.0. According to the ESLint docs removing `await` can make the code slower. Refs: https://eslint.org/docs/latest/rules/no-return-await
diff --git a/.eslintrc.js b/.eslintrc.js
@@ -256,7 +256,6 @@ module.exports = {
         message: 'Use `globalThis.crypto`.',
       },
     ],
-    'no-return-await': 'error',
     'no-self-compare': 'error',
     'no-tabs': 'error',
     'no-template-curly-in-string': 'error',
