Update next.md

Author: sylvestre

next.md

@@ -57,5 +57,6 @@ This file documents the pending improvements or regression:
 * https://github.com/uutils/coreutils/pull/7129
 * https://github.com/uutils/coreutils/pull/7225
 * https://github.com/uutils/coreutils/pull/7304
+* https://github.com/uutils/coreutils/pull/7408