build(deps-dev): bump electron from 2.0.18 to 15.5.5

Bumps [electron](https://github.com/electron/electron) from 2.0.18 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@v2.0.18...v15.5.5)

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

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

packages/graphql-playground-electron/package.json

@@ -148,7 +148,7 @@
     "babili-webpack-plugin": "0.1.2",
     "concurrently": "3.5.1",
     "css-loader": "0.28.11",
-    "electron": "2.0.18",
+    "electron": "15.5.5",
     "electron-builder": "^22.8.1",
     "electron-devtools-installer": "3.1.1",
     "extract-text-webpack-plugin": "3.0.2",