⬇️ Pin mistune to <3.1.0

[Zethson]

3.1.1 got released which also doesn't work. https://pypi.org/project/mistune/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.15%. Comparing base (d503387) to head (a3246f6).
Report is 45 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2437      +/-   ##
==========================================
- Coverage   91.71%   91.15%   -0.57%     
==========================================
  Files          62       62              
  Lines        9138     8388     -750     
==========================================
- Hits         8381     7646     -735     
+ Misses        757      742      -15     

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[github-actions]

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[Koncopd]

What is the problem actually?

[Zethson]

I am confused, I cannot reproduce it anymore. I had several errors for ln.finish() that went immediately away when I downgraded mistune. I'll keep observing...
I didn't copy the stacktrace back then because I saw that mistune was already pinned. Therefore I thought that the problem is already known