Chore(deps): Bump app-builder-lib and electron-builder

Bumps [app-builder-lib](https://github.com/electron-userland/electron-builder/tree/HEAD/packages/app-builder-lib) to 26.15.3 and updates ancestor dependency [electron-builder](https://github.com/electron-userland/electron-builder/tree/HEAD/packages/electron-builder). These dependencies need to be updated together.


Updates `app-builder-lib` from 26.8.1 to 26.15.3
- [Release notes](https://github.com/electron-userland/electron-builder/releases)
- [Changelog](https://github.com/electron-userland/electron-builder/blob/master/packages/app-builder-lib/CHANGELOG.md)
- [Commits](https://github.com/electron-userland/electron-builder/commits/electron-builder@26.15.3/packages/app-builder-lib)

Updates `electron-builder` from 26.8.1 to 26.15.3
- [Release notes](https://github.com/electron-userland/electron-builder/releases)
- [Changelog](https://github.com/electron-userland/electron-builder/blob/master/packages/electron-builder/CHANGELOG.md)
- [Commits](https://github.com/electron-userland/electron-builder/commits/electron-builder@26.15.3/packages/electron-builder)

---
updated-dependencies:
- dependency-name: app-builder-lib
  dependency-version: 26.15.3
  dependency-type: indirect
- dependency-name: electron-builder
  dependency-version: 26.15.3
  dependency-type: direct:development
...

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

pyinstaller/electron/package.json

@@ -21,7 +21,7 @@
   "license": "MIT",
   "devDependencies": {
     "electron": "^39.8.10",
-    "electron-builder": "^26.8.1"
+    "electron-builder": "^26.15.3"
   },
   "build": {
     "productName": "Specter",