devel/electron42: Update to 42.7.0

Changelog:

• https://github.com/electron/electron/releases/tag/v42.6.2
• https://github.com/electron/electron/releases/tag/v42.7.0

Reported by: GitHub (watch releases)

(cherry picked from commit fd67ba2aab44502a5d8d363a288a8340ae6a6157)