Bump electron from 14.2.9 to 15.5.5 in /core

Bumps [electron](https://github.com/electron/electron) from 14.2.9 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@v14.2.9...v15.5.5)

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

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

Author: dependabot[bot]