chore(deps): update dependency rollup to v2.38.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup (source)	2.37.1 -> 2.38.0

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Release Notes

rollup/rollup

### [`v2.38.0`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​2380) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.37.1...v2.38.0) _2021-01-22_ ##### Features - Entirely remove declared variables that only have an initializer side effect ([#​3933](https://togithub.com/rollup/rollup/issues/3933)) ##### Pull Requests - [#​3933](https://togithub.com/rollup/rollup/pull/3933): Tree-shake unused declarations while keeping initializer side-effects ([@​lukastaegert](https://togithub.com/lukastaegert))

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