remove extremely pointless rule

Author: Rich-Harris

eslint.config.js

@@ -18,7 +18,6 @@ export default [
 			'@typescript-eslint/no-floating-promises': 'error',
 			'@typescript-eslint/no-misused-promises': 'error',
 			'@typescript-eslint/prefer-promise-reject-errors': 'error',
-			'@typescript-eslint/promise-function-async': 'error',
 			'@typescript-eslint/require-await': 'error',
 			'no-console': 'error',
 			'lube/svelte-naming-convention': ['error', { fixSameNames: true }],