Electron Releases

Description of Change

• Followup to #47160. Unfortunately that PR did not fix the issue as it turns out the issue is caused by depot_tools being preinstalled on the widows runner image. This PR fixes the underlying issue by properly setting the path to the depot_tools installed as part of the build which will then resolve this error:

python3_bin_reldir.txt not found. need to initialize depot_tools by
running gclient, update_depot_tools or ensure_bootstrap.

Verified by building ffmpeg for a testing build here: https://github.com/electron/electron/actions/runs/15171656549/job/42663073571?pr=47194#step:23:43892

Once this PR makes it way through all supported branches, we can remove depot_tools from the windows runner image by reapplying electron/infra#120

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: none