Bump @electron-forge/maker-rpm from 7.4.0 to 7.6.1 in /tools/broker_ui

Bumps [@electron-forge/maker-rpm](https://github.com/electron/forge) from 7.4.0 to 7.6.1.
- [Release notes](https://github.com/electron/forge/releases)
- [Changelog](https://github.com/electron/forge/blob/main/CHANGELOG.md)
- [Commits](electron/forge@v7.4.0...v7.6.1)

---
updated-dependencies:
- dependency-name: "@electron-forge/maker-rpm"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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