Update dependency Markdown to v3.10.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Markdown (changelog)	3.10 → 3.10.3

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Release Notes

Python-Markdown/markdown (Markdown)

v3.10.3

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Fixed

• Fix SetextHeaderProcessor regex to prevent mixed = and - chars in setext-style headers (#​1606).
• Add AI Policy to Contributing Guide.
• Officially document all included extensions as being in maintenance mode.
• Link the Extension API documentation to the API Reference (#​1612).

v3.10.2

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Fixed

• Fix a regression related to comment handling (#​1590).
• More reliable fix for </ (#​1593).

v3.10.1

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Fixed

• Ensure nested elements inside inline comments are properly unescaped (#​1571).
• Make the docs build successfully with mkdocstrings-python 2.0 (#​1575).
• Fix infinite loop when multiple bogus or unclosed HTML comments appear in input (#​1578).
• Fix another infinite loop when handling bad comments (#​1586).

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