chore(deps-dev): bump dumi from 1.1.50 to 2.1.8

Bumps [dumi](https://github.com/umijs/dumi) from 1.1.50 to 2.1.8.
- [Release notes](https://github.com/umijs/dumi/releases)
- [Commits](https://github.com/umijs/dumi/compare/[email protected])

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

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

Author: dependabot[bot]

package.json

@@ -59,7 +59,7 @@
     "@types/react-dom": "^16.8.4",
     "@types/warning": "^3.0.0",
     "cross-env": "^7.0.0",
-    "dumi": "^1.1.0",
+    "dumi": "^2.1.8",
     "eslint": "^7.0.0",
     "father": "^4.0.0",
     "gh-pages": "^3.1.0",