Bump pymdown-extensions from 9.7 to 9.8

Bumps [pymdown-extensions](https://github.com/facelessuser/pymdown-extensions) from 9.7 to 9.8.
- [Release notes](https://github.com/facelessuser/pymdown-extensions/releases)
- [Commits](facelessuser/pymdown-extensions@9.7...9.8)

---
updated-dependencies:
- dependency-name: pymdown-extensions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -13,5 +13,5 @@ mkdocstrings-python-legacy==0.2.3
 pip-upgrader==1.4.15
 pydocstyle==6.1.1
 pyfakefs==5.0.0
-pymdown-extensions==9.7
+pymdown-extensions==9.8
 PyYAML==6.0