chore(deps-dev): bump rollup from 2.18.0 to 2.18.1

Bumps [rollup](https://github.com/rollup/rollup) from 2.18.0 to 2.18.1.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v2.18.0...v2.18.1)

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