Update electron-forge-maker-appimage requirement from ^24.6.3 to ^24.9.1

Updates the requirements on [electron-forge-maker-appimage](https://github.com/electron-userland/electron-builder/tree/HEAD/packages/electron-forge-maker-appimage) to permit the latest version.
- [Release notes](https://github.com/electron-userland/electron-builder/releases)
- [Changelog](https://github.com/electron-userland/electron-builder/blob/master/packages/electron-forge-maker-appimage/CHANGELOG.md)
- [Commits](https://github.com/electron-userland/electron-builder/commits/v24.9.1/packages/electron-forge-maker-appimage)

---
updated-dependencies:
- dependency-name: electron-forge-maker-appimage
  dependency-type: direct:development
...

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

package.json

@@ -26,7 +26,7 @@
     "@electron-forge/maker-squirrel": "^6.0.5",
     "@electron-forge/maker-zip": "^6.0.5",
     "electron": "^25.4.0",
-    "electron-forge-maker-appimage": "^24.6.3",
+    "electron-forge-maker-appimage": "^24.9.1",
     "electron-packager": "^17.1.1"
   },
   "dependencies": {