Bump pymdown-extensions from 8.1.1 to 10.0

Bumps [pymdown-extensions](https://github.com/facelessuser/pymdown-extensions) from 8.1.1 to 10.0.
- [Release notes](https://github.com/facelessuser/pymdown-extensions/releases)
- [Commits](facelessuser/pymdown-extensions@8.1.1...10.0)

---
updated-dependencies:
- dependency-name: pymdown-extensions
  dependency-type: direct:production
...

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

requirements.txt

@@ -15,7 +15,7 @@ mkdocs-material-extensions==1.0.1
 nltk==3.6.5
 packaging==20.9
 Pygments==2.8.0
-pymdown-extensions==8.1.1
+pymdown-extensions==10.0
 pyparsing==2.4.7
 python-dateutil==2.8.1
 PyYAML==5.4.1