Bump katex from 0.15.3 to 0.15.6

Bumps [katex](https://github.com/KaTeX/KaTeX) from 0.15.3 to 0.15.6.
- [Release notes](https://github.com/KaTeX/KaTeX/releases)
- [Changelog](https://github.com/KaTeX/KaTeX/blob/main/CHANGELOG.md)
- [Commits](https://github.com/KaTeX/KaTeX/compare/v0.15.3...v0.15.6)

---
updated-dependencies:
- dependency-name: katex
  dependency-type: direct:development
  update-type: version-update:semver-patch
...
Signed-off-by: dependabot[bot] <support@github.com>

yarn.lock

@@ -4918,9 +4918,9 @@ karma@^6.0.1:
     yargs "^16.1.1"
 
 katex@^0.15.1:
-  version "0.15.3"
-  resolved "https://registry.yarnpkg.com/katex/-/katex-0.15.3.tgz#08781a7ed26800b20380d959d1ffcd62bca0ec14"
-  integrity sha512-Al6V7RJsmjklT9QItyHWGaQCt+NYTle1bZwB1e9MR/tLoIT1MXaHy9UpfGSB7eaqDgjjqqRxQOaQGrALCrEyBQ==
+  version "0.15.6"
+  resolved "https://registry.yarnpkg.com/katex/-/katex-0.15.6.tgz#c4e2f6ced2ac4de1ef6f737fe7c67d3026baa0e5"
+  integrity sha512-UpzJy4yrnqnhXvRPhjEuLA4lcPn6eRngixW7Q3TJErjg3Aw2PuLFBzTkdUb89UtumxjhHTqL3a5GDGETMSwgJA==
   dependencies:
     commander "^8.0.0"