chore(deps): bump electron in /packages/debugger-shell

Bumps [electron](https://github.com/electron/electron) from 36.3.0 to 39.8.4.
- [Release notes](https://github.com/electron/electron/releases)
- [Commits](electron/electron@v36.3.0...v39.8.4)

---
updated-dependencies:
- dependency-name: electron
  dependency-version: 39.8.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/debugger-shell/package.json

@@ -31,7 +31,7 @@
   },
   "dependencies": {
     "cross-spawn": "^7.0.6",
-    "electron": "36.3.0"
+    "electron": "39.8.4"
   },
   "devDependencies": {
     "semver": "^7.1.3"