Add new pull request link to next.md

Author: sylvestre

next.md

@@ -85,3 +85,4 @@ This file documents the pending improvements or regression:
 * https://github.com/uutils/coreutils/pull/8521
 * https://github.com/uutils/coreutils/pull/8843
 * https://github.com/uutils/coreutils/pull/9035
+* https://github.com/uutils/coreutils/pull/9016