Bump rollup from 4.18.0 to 4.21.2 in the rollup group across 1 directory

Bumps the rollup group with 1 update in the / directory: [rollup](https://github.com/rollup/rollup).


Updates `rollup` from 4.18.0 to 4.21.2
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v4.18.0...v4.21.2)

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

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

Author: dependabot[bot]