Bump pymdown-extensions from 10.21.3 to 11.0

[dependabot]

Bumps pymdown-extensions from 10.21.3 to 11.0.

Release notes

Sourced from pymdown-extensions's releases.

11.0

• BREAK: B64: Restricts relative links to base_path by default. Can be disabled by setting new restrict_path option to False. The new root_path can be specified if paths are desired to be restricted to a different location separate base_path which is also used as a relative base for image paths.
• NEW: Drop Python 3.9 support.
• FIX: Tabbed: Fix issue where an empty title would cause an exception.

Commits

• 6d0097b Update changelog
• f4808ea Bump version and update changelog
• a290074 Update JS doc deps
• edce355 Merge commit from fork
• 9fb9643 Update Python type deps
• 299a129 Docs: Update JS deps
• 367d965 Drop Python 3.9 (#2902)
• 19ec936 Fix issue with empty titles and Tabbed (#2901)
• 4868783 Fix npm option
• 18a21f5 zensical config should be stored in sdist
• Additional commits viewable in compare view

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Note

Low Risk
Docs-only transitive dependency with no config changes; main runtime risk is verifying MkDocs still builds, especially tabbed content.

Overview
Updates the locked pymdown-extensions package from 10.21.3 to 11.0 in uv.lock (pulled in via mkdocs-material for docs builds). No application or MkDocs config files change in this diff.

11.0 drops Python 3.9 (this repo already requires ≥3.10), fixes Tabbed when titles are empty (relevant because mkdocs.yml enables pymdownx.tabbed), and includes a breaking change to B64 relative-link handling under base_path—that extension is not configured here, so it should not affect current docs.

^{Reviewed by Cursor Bugbot for commit 15c5c5c. Bugbot is set up for automated code reviews on this repo. Configure here.}