Add link to pull request #9599

Author: sylvestre

next.md

@@ -24,3 +24,4 @@ This file documents the pending improvements or regression:
 * https://github.com/uutils/coreutils/pull/9490
 * https://github.com/uutils/coreutils/pull/9465
 * https://github.com/uutils/coreutils/pull/9144
+* https://github.com/uutils/coreutils/pull/9599