fix(eslint-config): remove the unnecessary .mjs extension from extraFileExtensions (#605)

Co-authored-by: Jeroen Claassens <support@favware.tech>

Author: nikolaischunk

packages/eslint-config/src/index.ts

@@ -11,7 +11,6 @@ const eslintConfig = {
 	root: true,
 	parser: '@typescript-eslint/parser',
 	parserOptions: {
-		extraFileExtensions: ['.mjs'],
 		project: './tsconfig.eslint.json',
 		sourceType: 'module',
 		ecmaVersion: 2020,

packages/eslint-config/tests/__snapshots__/eslint.test.ts.snap

@@ -18,9 +18,6 @@ exports[`ESLint Config > should export rules 1`] = `
   "parser": "@typescript-eslint/parser",
   "parserOptions": {
     "ecmaVersion": 2020,
-    "extraFileExtensions": [
-      ".mjs",
-    ],
     "project": "./tsconfig.eslint.json",
     "sourceType": "module",
     "warnOnUnsupportedTypeScriptVersion": false,