Update dependency rollup to v2.37.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup (source)	2.37.0 -> 2.37.1

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Release Notes

rollup/rollup

### [`v2.37.1`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​2371) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.37.0...v2.37.1) _2021-01-20_ ##### Pull Requests - [#​3929](https://togithub.com/rollup/rollup/pull/3929): Deduplicate acorn import ([@​lukastaegert](https://togithub.com/lukastaegert))

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