chore(deps): bump rehype-katex from 6.0.2 to 6.0.3

Bumps [rehype-katex](https://github.com/remarkjs/remark-math) from 6.0.2 to 6.0.3.
- [Release notes](https://github.com/remarkjs/remark-math/releases)
- [Commits](https://github.com/remarkjs/remark-math/compare/rehype-katex@6.0.2...rehype-katex@6.0.3)

---
updated-dependencies:
- dependency-name: rehype-katex
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>