Update dependency Markdown to v3.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Markdown (changelog)	==3.6 -> ==3.7

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Release Notes

Python-Markdown/markdown (Markdown)

### [`v3.7`](https://togithub.com/Python-Markdown/markdown/compare/3.6...3.7) [Compare Source](https://togithub.com/Python-Markdown/markdown/compare/3.6...3.7)

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