Add link to pull request #9133 in next.md

Author: sylvestre

next.md

@@ -2,4 +2,5 @@ This file documents the pending improvements or regression:
 
 * https://github.com/uutils/coreutils/pull/9063
 * https://github.com/uutils/coreutils/issues/5705
-* https://github.com/uutils/coreutils/pull/9016 - merged but not yet reflected in test results  
+* https://github.com/uutils/coreutils/pull/9016 - merged but not yet reflected in test results
+* https://github.com/uutils/coreutils/pull/9133