chore(deps): update dependency rollup to v3.21.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup (source)	3.21.5 -> 3.21.6

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Release Notes

rollup/rollup

### [`v3.21.6`](https://togithub.com/rollup/rollup/blob/HEAD/CHANGELOG.md#​3216) [Compare Source](https://togithub.com/rollup/rollup/compare/v3.21.5...v3.21.6) *2023-05-09* ##### Bug Fixes - Ensure Rollup CLI prints everything to stdout before exiting ([#​4980](https://togithub.com/rollup/rollup/issues/4980)) ##### Pull Requests - [#​4980](https://togithub.com/rollup/rollup/pull/4980): chore(deps): lock file maintenance minor/patch updates ([@​renovate](https://togithub.com/renovate)\[bot]) - [#​4983](https://togithub.com/rollup/rollup/pull/4983): Prevent exit before stdout is drained ([@​lukastaegert](https://togithub.com/lukastaegert))

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