Update next.md

Author: sylvestre

next.md

@@ -32,3 +32,4 @@ This file documents the pending improvements or regression:
 * https://github.com/uutils/coreutils/pull/6621/
 * https://github.com/uutils/coreutils/pull/6907
 * https://github.com/uutils/coreutils/pull/6906
+* https://github.com/uutils/coreutils/pull/6933