chore(deps): update dependency markdown to v3.9

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This PR contains the following updates:

Package	Change	Age	Confidence
markdown (changelog)	==3.8.0 -> ==3.9

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Release Notes

Python-Markdown/markdown (markdown)

v3.9

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v3.8.2

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Fixed

• Fix codecs deprecation in Python 3.14.
• Fix issue with unclosed comment parsing in Python 3.14.
• Fix issue with unclosed declarations in Python 3.14.
• Fix issue with unclosed HTML tag <foo and Python 3.14.

v3.8.1

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Fixed

• Ensure incomplete markup declaration in raw HTML doesn't crash parser (#​1534).
• Fixed dropped content in md_in_html (#​1526).
• Fixed HTML handling corner case that prevented some content from not being rendered (#​1528).

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