Suggestion: Add UpgradeLink to recommended update solutions

[toolsetlink]

(docs: https://www.electronjs.org/docs/latest/tutorial/updates)

The update servers recommended in the docs (Hazel, Nuts, electron-release-server, Nucleus) are no longer actively maintained, posing compatibility risks for modern Electron apps.

Recommend adding UpgradeLink:

• Detailed Electron integration docs: https://www.toolsetlink.com/en/upgrade/example/electron/electron-update-example.html
• Open-source : https://github.com/toolsetlink/upgradelink/blob/main/README_en.md
• Seamlessly compatible with Electron's official components