Bump tar and dmg-builder in /build (#295921)

Bumps [tar](https://github.com/isaacs/node-tar) to 7.5.9 and updates ancestor dependency [dmg-builder](https://github.com/electron-userland/electron-builder/tree/HEAD/packages/dmg-builder). These dependencies need to be updated together.


Updates `tar` from 6.2.1 to 7.5.9
- [Release notes](https://github.com/isaacs/node-tar/releases)
- [Changelog](https://github.com/isaacs/node-tar/blob/main/CHANGELOG.md)
- [Commits](https://github.com/isaacs/node-tar/compare/v6.2.1...v7.5.9)

Updates `dmg-builder` from 26.5.0 to 26.7.0
- [Release notes](https://github.com/electron-userland/electron-builder/releases)
- [Changelog](https://github.com/electron-userland/electron-builder/blob/master/packages/dmg-builder/CHANGELOG.md)
- [Commits](https://github.com/electron-userland/electron-builder/commits/[email protected]/packages/dmg-builder)

---
updated-dependencies:
- dependency-name: tar
  dependency-version: 7.5.9
  dependency-type: indirect
- dependency-name: dmg-builder
  dependency-version: 26.7.0
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>