build(deps-dev): bump browserslist from 4.20.4 to 4.21.0

Bumps [browserslist](https://github.com/browserslist/browserslist) from 4.20.4 to 4.21.0.
- [Release notes](https://github.com/browserslist/browserslist/releases)
- [Changelog](https://github.com/browserslist/browserslist/blob/main/CHANGELOG.md)
- [Commits](browserslist/browserslist@4.20.4...4.21.0)

---
updated-dependencies:
- dependency-name: browserslist
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>