Bump electron from 13.6.6 to 15.5.5

Bumps [electron](https://github.com/electron/electron) from 13.6.6 to 15.5.5.
- [Release notes](https://github.com/electron/electron/releases)
- [Changelog](https://github.com/electron/electron/blob/main/docs/breaking-changes.md)
- [Commits](electron/electron@v13.6.6...v15.5.5)

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

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

package.json

@@ -7,7 +7,7 @@
   "chromium-args": "--in-process-gpu --disable-direct-composition --disable-transparency",
   "devDependencies": {
     "clean-css-cli": "^4.3.0",
-    "electron": "^13.6.6",
+    "electron": "^15.5.5",
     "electron-packager": "^15.2.0",
     "google-closure-compiler": "^20210106.0.0"
   },