Upgrade toybox to 12bbc85e8a4cc190a818e8f3126e73433448c9a6

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/+/main:tools/external_updater/README.md

Test: TreeHugger
Change-Id: I200d64fed660839ead2ebcdaed947ed97cdafb9f