build: Update ESLint to v9 (#16639)

packages/@n8n/imap/.eslintrc.js

@@ -1,16 +0,0 @@
-const sharedOptions = require('@n8n/eslint-config/shared');
-
-/**
- * @type {import('@types/eslint').ESLint.ConfigData}
- */
-module.exports = {
-	extends: ['@n8n/eslint-config/base'],
-
-	...sharedOptions(__dirname),
-
-	rules: {
-		'unicorn/filename-case': ['error', { case: 'kebabCase' }],
-		'@typescript-eslint/consistent-type-imports': 'error',
-		'n8n-local-rules/no-plain-errors': 'off',
-	},
-};

packages/@n8n/imap/eslint.config.mjs

@@ -0,0 +1,16 @@
+import { defineConfig } from 'eslint/config';
+import { baseConfig } from '@n8n/eslint-config/base';
+
+export default defineConfig(baseConfig, {
+	rules: {
+		'unicorn/filename-case': ['error', { case: 'kebabCase' }],
+		'@typescript-eslint/consistent-type-imports': 'error',
+		'n8n-local-rules/no-plain-errors': 'off',
+
+		// TODO: Remove this
+		'@typescript-eslint/no-unnecessary-boolean-literal-compare': 'warn',
+		'@typescript-eslint/prefer-nullish-coalescing': 'warn',
+		'@typescript-eslint/no-floating-promises': 'warn',
+		'import-x/order': 'warn',
+	},
+});