Electron-main fails on electron ^30.0.0

[julienmalard]

Describe the bug
Ægir on electron-main fails with electron >= 30.0.0

To Reproduce
Steps to reproduce the behavior:

1. Add electron=^30.0.0 to the development dependencies of a project using Ægir
2. run aegir test -t electron-main --cov

Expected behavior
The tests should run.

Screenshots
Tests hang (without error messages) after the message "Downloading electron" and "Extracting electron"

Desktop (please complete the following information):

• OS: macOS

Additional context
Electron up to ^29.0.0 works.