[test]: can't run test suite locally on MacOS arm64

[VerteDinde]

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• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• I have searched the issue tracker for a bug that matches the one I want to file, without success.

Issue Details

• Electron Packager Version:
  • main/15.5.0
• Electron Version:
  • Electron 6.0.0 (headers used in test suite)
• Operating System:
  • macOS 12.4.0 arm64
• Last Known Working Electron Packager version::
  • N/A, issue is specific to Apple Silicon

Expected Behavior

Running ./test/ci/before_install.sh and npm test should run the test suite locally.

Actual Behavior

Running npm test works as expected on x64, but fails on arm64 with the following error:

Downloading Electron v1.4.13 before running tests...
HTTPError: Response code 404 (Not Found) for https://github.com/electron/electron/releases/download/v6.0.0/electron-v6.0.0-darwin-arm64.zip

This is almost certainly because Electron 6 was released before arm64 was available, and there was no version of Electron being built for arm64. While there are several tests that depend on testing specific Electron versions (e.g. 6.0.0), we may want to modify tests that don't depend on those versions to be able to run locally on an arm64 machine.

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