Log Message:
sysutils/broot: update to 1.40.0

Major Feature: preview transformers

You can now define preview transformers to be applied before preview.
They allow for example previewing PDF or Office files, or beautifying JSON files.
Edit the preview_transformers array in your conf.hjson file.
See https://dystroy.org/broot/conf_file/#preview

Fixes
 - fix search on root - Fix #904
 - fix some verb cycling problems - Fix #902