chore(deps-dev): bump cssstyle from 2.3.0 to 4.2.1

Bumps [cssstyle](https://github.com/jsdom/cssstyle) from 2.3.0 to 4.2.1.
- [Release notes](https://github.com/jsdom/cssstyle/releases)
- [Commits](jsdom/cssstyle@v2.3.0...v4.2.1)

---
updated-dependencies:
- dependency-name: cssstyle
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -64,7 +64,7 @@
     "@umijs/test": "^4.0.36",
     "coveralls": "^3.0.6",
     "cross-env": "^7.0.3",
-    "cssstyle": "^2.3.0",
+    "cssstyle": "^4.2.1",
     "dumi": "^2.1.2",
     "eslint": "^7.0.0",
     "father": "^4.1.1",