Bump sphinxcontrib-katex from 0.9.6 to 0.9.9

Bumps [sphinxcontrib-katex](https://github.com/hagenw/sphinxcontrib-katex) from 0.9.6 to 0.9.9.
- [Release notes](https://github.com/hagenw/sphinxcontrib-katex/releases)
- [Changelog](https://github.com/hagenw/sphinxcontrib-katex/blob/main/CHANGELOG.rst)
- [Commits](hagenw/sphinxcontrib-katex@v0.9.6...v0.9.9)

---
updated-dependencies:
- dependency-name: sphinxcontrib-katex
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

setup.py

@@ -117,7 +117,7 @@ def package_files(prefix: str, directory: str, extension: str):
     'docutils==0.17.1',
     'sphinx_markdown_tables==0.0.17',
     'sphinx-argparse==0.4.0',
-    'sphinxcontrib.katex==0.9.6',
+    'sphinxcontrib.katex==0.9.9',
     'sphinxcontrib-applehelp==1.0.0',
     'sphinxcontrib-devhelp==1.0.0',
     'sphinxcontrib-htmlhelp==2.0.0',