Ensure fenced code attributes are properly escaped.

Python-Markdown / markdown

A Python implementation of John Gruber’s Markdown with Extension support.

https://python-markdown.github.io/

BSD 3-Clause "New" or "Revised" License

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Closed waylan closed 2 years ago

waylan commented 2 years ago

Fixes #1247.

Note that the relevant sections of code were also converted to use f-strings.