Update dependency browserslist to v4.21.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
browserslist	4.21.0 -> 4.21.1

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Release Notes

browserslist/browserslist

### [`v4.21.1`](https://togithub.com/browserslist/browserslist/blob/HEAD/CHANGELOG.md#​4211) [Compare Source](https://togithub.com/browserslist/browserslist/compare/4.21.0...4.21.1) - Fixed parsing days in `since` query.

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