Update dependency Markdown to >=3.5.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Markdown (changelog)	>=3.5.1 -> >=3.5.2

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Release Notes

Python-Markdown/markdown (Markdown)

v3.5.2

Compare Source

Fixed

• Fix type annotations for convertFile - it accepts only bytes-based buffers.
  Also remove legacy checks from Python 2 (#​1400)
• Remove legacy import needed only in Python 2 (#​1403)
• Fix typo that left the attribute AdmonitionProcessor.content_indent unset
  (#​1404)
• Fix edge-case crash in InlineProcessor with AtomicString (#​1406).
• Fix edge-case crash in codehilite with an empty code tag (#​1405).
• Improve and expand type annotations in the code base (#​1401).
• Fix handling of bogus comments (#​1425).

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[psschwei]

We aren't actually using the markdown package anywhere, so closing this and will submit a PR to drop it from the requirements files

[renovate]

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