⬆️ Bump @umijs/test from 4.3.12 to 4.3.20

Bumps [@umijs/test](https://github.com/umijs/umi) from 4.3.12 to 4.3.20.
- [Release notes](https://github.com/umijs/umi/releases)
- [Commits](umijs/umi@v4.3.12...v4.3.20)

---
updated-dependencies:
- dependency-name: "@umijs/test"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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