Build(deps-dev): Bump rollup from 2.20.0 to 2.21.0 (#8720)
Bumps [rollup](https://github.com/rollup/rollup) from 2.20.0 to 2.21.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v2.20.0...v2.21.0)
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