Upgrade Electron example dependency to 42.2.0

[Copilot]

This updates the examples/electron app to Electron 42.2.0 to align the example with the requested runtime version. The change is limited to dependency metadata and lock resolution for that example.

• Dependency bump

  • Updated examples/electron/package.json:
    • electron: ^39.8.5 → ^42.2.0

• Lockfile refresh

  • Regenerated examples/electron/package-lock.json so the resolved Electron package graph matches 42.2.0.

• Scope

  • No application logic or renderer/main process code changes; this PR only adjusts versioning for the Electron example.

// examples/electron/package.json
"dependencies": {
  "@xterm/xterm": "^6.0.0",
  "electron": "^42.2.0"
}

Original prompt

Migrate the example electron to 42.2.0. Create a PR.

Created from VS Code.