fs: remove workaround for esm package

PR-URL: #50907
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>

lib/internal/fs/utils.js

@@ -497,10 +497,6 @@ function Stats(dev, mode, nlink, uid, gid, rdev, blksize,
 ObjectSetPrototypeOf(Stats.prototype, StatsBase.prototype);
 ObjectSetPrototypeOf(Stats, StatsBase);
 
-// HACK: Workaround for https://github.com/standard-things/esm/issues/821.
-// TODO(ronag): Remove this as soon as `esm` publishes a fixed version.
-Stats.prototype.isFile = StatsBase.prototype.isFile;
-
 Stats.prototype._checkModeProperty = function(property) {
   if (isWindows && (property === S_IFIFO || property === S_IFBLK ||
     property === S_IFSOCK)) {