Bump rehype-katex from 5.0.0 to 6.0.2

Bumps [rehype-katex](https://github.com/remarkjs/remark-math) from 5.0.0 to 6.0.2.
- [Release notes](https://github.com/remarkjs/remark-math/releases)
- [Commits](https://github.com/remarkjs/remark-math/compare/rehype-katex@5.0.0...rehype-katex@6.0.2)

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

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

package.json

@@ -28,7 +28,7 @@
     "react": "17.0.2",
     "react-dom": "17.0.2",
     "react-iframe": "1.8.5",
-    "rehype-katex": "5",
+    "rehype-katex": "6",
     "remark-math": "3",
     "url-loader": "4.1.1"
   },