Upgrade toybox to 7768b83385b2fa7bd095f7fa6a118635bfefdcbb

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: I0ffca3826218b34768e69bd65bbc782dde38eec3