Upgrade toybox to 3ad2a87991aae26f4041031c27dbbf63d5ec1ca7

This project was upgraded with external_updater.
Usage: tools/external_updater/updater.sh update external/toybox
For more info, check https://cs.android.com/android/platform/superproject/+/main:tools/external_updater/README.md

Test: TreeHugger
Change-Id: Ie7edbaef5b9e5532e2527e445a5296d723069ab2