Bump katex and dumi

Removes [katex](https://github.com/KaTeX/KaTeX). It's no longer used after updating ancestor dependency [dumi](https://github.com/umijs/dumi). These dependencies need to be updated together.


Removes `katex`

Updates `dumi` from 1.1.32 to 2.4.7
- [Release notes](https://github.com/umijs/dumi/releases)
- [Commits](https://github.com/umijs/dumi/compare/[email protected])

---
updated-dependencies:
- dependency-name: katex
  dependency-type: indirect
- dependency-name: dumi
  dependency-type: direct:development
...

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