build(deps): bump pymdown-extensions (#4331)

Bumps the mkdocs-deps group in /hack/mkdocs/image with 1 update: [pymdown-extensions](https://github.com/facelessuser/pymdown-extensions).


Updates `pymdown-extensions` from 10.17.2 to 10.18
- [Release notes](https://github.com/facelessuser/pymdown-extensions/releases)
- [Commits](facelessuser/pymdown-extensions@10.17.2...10.18)

---
updated-dependencies:
- dependency-name: pymdown-extensions
  dependency-version: '10.18'
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: mkdocs-deps
...

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

Author: dependabot[bot]

hack/mkdocs/image/requirements.txt

@@ -16,7 +16,7 @@ mkdocs-mermaid2-plugin==1.2.3
 pandas>=2.0.3
 pep562==1.1
 Pygments==2.19.2
-pymdown-extensions==10.17.2
+pymdown-extensions==10.18
 PyYAML==6.0.3
 six==1.17.0
 tabulate==0.9.0