Bump electron from 25.3.0 to 25.8.4 in /release/app

Bumps [electron](https://github.com/electron/electron) from 25.3.0 to 25.8.4.
- [Release notes](https://github.com/electron/electron/releases)
- [Changelog](https://github.com/electron/electron/blob/main/docs/breaking-changes.md)
- [Commits](https://github.com/electron/electron/compare/v25.3.0...v25.8.4)

---
updated-dependencies:
- dependency-name: electron
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

release/app/package.json

@@ -18,7 +18,7 @@
         "ws": "^8.13.0"
     },
     "devDependencies": {
-        "electron": "25.3.0"
+        "electron": "25.8.4"
     },
     "license": "GPL-3.0"
 }