Bump electron from 43.0.0 to 43.5.0 in /packages/debugger-shell

Bumps [electron](https://github.com/electron/electron) from 43.0.0 to 43.5.0.
- [Release notes](https://github.com/electron/electron/releases)
- [Commits](electron/electron@v43.0.0...v43.5.0)

---
updated-dependencies:
- dependency-name: electron
  dependency-version: 43.5.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

packages/debugger-shell/package.json

@@ -46,7 +46,7 @@
     "fb-dotslash": "0.5.8"
   },
   "devDependencies": {
-    "electron": "43.0.0",
+    "electron": "43.5.0",
     "semver": "^7.1.3"
   },
   "files": [