Bump rollup from 1.21.0 to 1.21.2
Bump rollup from 1.21.0 to 1.21.2

Bumps [rollup](https://github.com/rollup/rollup) from 1.21.0 to 1.21.2.
- [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/v1.21.0...v1.21.2)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
vega/vega-embed,vega/vega-embed,vega/vega-embed,vega/vega-embed