chore(deps): bump pymdown-extensions in /docs/_build

Bumps [pymdown-extensions](https://github.com/facelessuser/pymdown-extensions) from 10.14.3 to 10.15.
- [Release notes](https://github.com/facelessuser/pymdown-extensions/releases)
- [Commits](https://github.com/facelessuser/pymdown-extensions/compare/10.14.3...10.15)

---
updated-dependencies:
- dependency-name: pymdown-extensions
  dependency-version: '10.15'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

docs/_build/requirements.txt

@@ -12,7 +12,7 @@ mkdocs-material==9.6.12
 mkdocs-material-extensions==1.3.1
 packaging==25.0
 Pygments==2.19.1
-pymdown-extensions==10.14.3
+pymdown-extensions==10.15
 pyparsing==3.2.3
 python-dateutil==2.9.0.post0
 PyYAML==6.0.2