feat: make check for updates menu item dynamic

[nmggithub]

What Changed

EDIT: I was dumb and didn't realize I wasn't actually testing on a newer version of Electron. This PR makes changes and updates electron to the minimal version needed for this feature to work.

This PR cannot be merged in its current state as it depends on features not in upstream Electron yet, but I hope for that to change in the near future. Refs: electron/electron#50266

Once Electron truly supports it, this will allow us to change the label of the "Checking for Updates..." menu item on the fly.

Why

This provides a much better user experience by giving visual indications of what is happening during the update process.

UI Changes

To be added later, when this actually works.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Make the 'Check for Updates' menu item dynamic based on updater state

• Introduces updateStateListeners, a set of listeners that fire whenever setUpdateState is called, replacing the previous direct emitUpdateState() call.
• Adds makeCheckForUpdatesMenuItem to create shared MenuItem instances for the macOS app menu and Help menu, and updateCheckForUpdatesMenuItem to update their label and enabled state based on DesktopUpdateState.status.
• The menu item is disabled and shows status-specific labels (e.g. "Downloading Update…", "Update Available") during all non-idle states, and re-enables when idle.
• Bumps the electron dependency from 40.6.0 to 40.7.0.

^{Macroscope summarized 7b1d5e1.}

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