Use an Electron Builder version that supports notarytool

We need the following patch (from the release notes of v25.0.0-alpha.6)
https://github.com/electron-userland/electron-builder/releases

> feat: Make notarization with Apple ID more usable by
> https://github.com/electron-userland/electron-builder/pull/8159

desktop/package.json

@@ -45,7 +45,7 @@
         "@typescript-eslint/parser": "^7",
         "concurrently": "^8",
         "electron": "^30",
-        "electron-builder": "^24",
+        "electron-builder": "25.0.0-alpha.6",
         "electron-builder-notarize": "^1.5",
         "eslint": "^8",
         "prettier": "^3",