Bump markdown from 3.3.7 to 3.4.1

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.3.7 to 3.4.1.
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Commits](https://github.com/Python-Markdown/markdown/compare/3.3.7...3.4.1)
11 jobs for dependabot/pip/markdown-3.4.1 in 3 minutes and 44 seconds (queued for 6 minutes and 25 seconds)
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