Update next.md

Author: sylvestre

next.md

@@ -80,3 +80,6 @@ This file documents the pending improvements or regression:
 * https://github.com/uutils/coreutils/pull/8749
 * https://github.com/uutils/coreutils/pull/8748
 * https://github.com/uutils/coreutils/pull/8307
+* https://github.com/uutils/coreutils/pull/8296
+* https://github.com/uutils/coreutils/pull/8296
+* https://github.com/uutils/coreutils/pull/8521