Bump rollup from 2.6.1 to 2.7.1 (#8124)
Bumps [rollup](https://github.com/rollup/rollup) from 2.6.1 to 2.7.1.
- [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/v2.6.1...v2.7.1)
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