npm: bump rollup from 1.32.1 to 4.21.1 in /dashboard

Bumps [rollup](https://github.com/rollup/rollup) from 1.32.1 to 4.21.1.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v1.32.1...v4.21.1)

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

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