Bump electron from 9.4.0 to 15.5.5

Bumps [electron](https://github.com/electron/electron) from 9.4.0 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@v9.4.0...v15.5.5)

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

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

package.json

@@ -43,7 +43,7 @@
     "@vue/cli-plugin-eslint": "^3.9.2",
     "@vue/cli-service": "^3.9.3",
     "babel-eslint": "^10.0.1",
-    "electron": "^9.4.0",
+    "electron": "^15.5.5",
     "eslint": "^5.16.0",
     "eslint-plugin-vue": "^5.2.3",
     "tailwindcss": "^1.9.6",