Bump depot_tools revision
Created by: rogerzanoni
This fixes the following issue while bootstrapping depot_tools as a dependency of CEF on AGL:
Could not find a version that satisfies the requirement setuptools>=40.3.0 (from google_api_core==1.31.5->-r /tmp/vpython_bootstrap882189871/requirements.txt (line 22)) (from versions:) No matching distribution found for setuptools>=40.3.0 (from google_api_core==1.31.5->-r /tmp/vpython_bootstrap882189871/requirements.txt (line 22))