fix: upgrade pymdown-extensions to 10.21.2 for Pygments 2.20.0 compatibility#86
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Pygments 2.20.0 changed handling of None filename values, causing mkdocs build to fail with AttributeError in html.escape(). pymdownx 10.21.2 explicitly fixes this incompatibility.
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Summary\n\n- Upgrades
pymdown-extensionsfrom 10.21 to 10.21.2 to fix compatibility with Pygments 2.20.0\n\n## Context\n\nThe Pygments 2.20.0 upgrade (merged in #85 to fix CVE-2026-4539) introduced a breaking change whereNonefilename values causeAttributeErrorinhtml.escape(). pymdown-extensions 10.21.2 explicitly handles this case.\n\nRef: facelessuser/pymdown-extensions#2863