Bump rollup from 2.3.0 to 2.3.1 (#7913)
Bumps [rollup](https://github.com/rollup/rollup) from 2.3.0 to 2.3.1.
- [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/v2.3.0...v2.3.1)
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