Bump jinja2 from 3.0.3 to 3.1.3 (security fix)

Fixes GHSA-h5c8-rqwp-cp95 - xmlattr filter vulnerability

Closes #314

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: nbhansen

requirements.txt

@@ -2,5 +2,5 @@
 mkdocs-awesome-pages-plugin==2.4.0
 mkdocs-git-revision-date-localized-plugin==0.4.8
 mkdocs-material==4.6.3
-jinja2==3.0.3
+jinja2==3.1.3
 mkdocs-mermaid2-plugin==1.2.3