Bump electron from 11.5.0 to 15.5.5 (#13)

Bumps [electron](https://github.com/electron/electron) from 11.5.0 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@v11.5.0...v15.5.5)

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

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -66,7 +66,7 @@
     "chalk": "1.1.3",
     "coveralls": "2.11.9",
     "del": "^2.2.0",
-    "electron": "11.5.0",
+    "electron": "15.5.5",
     "electron-mocha": "3.2.0",
     "electron-osx-sign": "^0.4.1",
     "electron-prebuilt": "^1.4.13",