Bump pymdown-extensions from 9.10 to 10.0 in /requirements (#129)

Bumps [pymdown-extensions](https://github.com/facelessuser/pymdown-extensions) from 9.10 to 10.0.
- [Release notes](https://github.com/facelessuser/pymdown-extensions/releases)
- [Commits](facelessuser/pymdown-extensions@9.10...10.0)

---
updated-dependencies:
- dependency-name: pymdown-extensions
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/docs.txt

@@ -56,7 +56,7 @@ pygments==2.15.0
     # via
     #   -r docs.in
     #   mkdocs-material
-pymdown-extensions==9.10
+pymdown-extensions==10.0
     # via mkdocs-material
 python-dateutil==2.8.2
     # via ghp-import