Bump electron from 39.0.0 to 39.2.4 in /benchmark/01-empty-app/electron

---
updated-dependencies:
- dependency-name: electron
  dependency-version: 39.2.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]