Log Message:
sysutils/dua-cli: update to 2.21.0

2.21.0 (2023-12-06)
New Features
 - With a single path provided as root, pretend it's the current working dir
   This makes it seem like the user started the directory walk directly in the
   given directory, which is more intuitive than the previous approach only
   showed the given directory as top-level directory.

   Note that this change only affects invocations like dua <dir> or dua i \ 
<dir>.

 - press m to sort by modification date, ascending and descending.

Bug Fixes
 - slightly faster (0.5ms) startup times of the binary on MacOS and maybe Linux.