Add link to PR 9328 in next.md

Author: sylvestre

next.md

@@ -10,3 +10,4 @@ This file documents the pending improvements or regression:
 * https://github.com/uutils/coreutils/pull/9203
 * https://github.com/uutils/coreutils/pull/9126
 * https://github.com/uutils/coreutils/pull/9252
+* https://github.com/uutils/coreutils/pull/9328