Upgrade toybox to 3c276ac106a4e3c0955149cc4a800ab95c1f296a

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: I52b360058a98db01541bdc3d92009b7b2f0af454