Bump electron from 20.2.0 to 21.0.0

Bumps [electron](https://github.com/electron/electron) from 20.2.0 to 21.0.0.
- [Release notes](https://github.com/electron/electron/releases)
- [Changelog](https://github.com/electron/electron/blob/main/docs/breaking-changes.md)
- [Commits](https://github.com/electron/electron/compare/v20.2.0...v21.0.0)

---
updated-dependencies:
- dependency-name: electron
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -64,7 +64,7 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "electron": "^20.2.0",
+    "electron": "^21.0.0",
     "electron-builder": "^23.3.3",
     "eslint": "^8.24.0"
   },