build: bump mkdocs-material -> 9.6.23

[Valastiri]

Summary

This is in preperation for the move to Zensical as part of Stage 1. This is also before moving to 9.7.0

As mentioned on Migration Plan on Discord:
Reference on Stage 1 – Update Existing Docs
Upgrade to Material for MkDocs 9.7.0, the final feature-complete release. Minimal feature changes expected.

Notable Upstream Updates

• Large font size setting throws of breakpoints in JavaScript
• Improved semantic markup of "edit this page" button
• Improved info plugin virtual environment resolution
• Info plugin doesn't correctly detect virtualenv in some cases
• Videos do not autoplay when inside a content tab
• Stroke width not effective in Mermaid.js diagrams
• Fixed last compat issues with minijinja, now 100% compatible
• Added support for Python 3.14
• FontAwesome icons color not set in social cards (regression)
• Deprecation warning as of Python 3.14 in Emoji extension
• & character not escaped in search highlighting
• Temporary pin of click dependency

Location

requirements.txt

Discord username (if different from GitHub): valastiri

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