MAINT: Use mypy recursive type support

[j-t-1]

In mypy>=1.7 recursive type support is built-in.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.44%. Comparing base (e14b991) to head (5c3c279).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2898      +/-   ##
==========================================
+ Coverage   96.43%   96.44%   +0.01%     
==========================================
  Files          52       52              
  Lines        8726     8726              
  Branches     1721     1589     -132     
==========================================
+ Hits         8415     8416       +1     
  Misses        182      182              
+ Partials      129      128       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[j-t-1]

Is this failing because mypy==1.4.1 is being used in ci.txt?

Fixable if pip-compile requirements/ci.in is run with Python 3.8?

[stefan6419846]

These are docs build issues, not related to mypy. They might be fixed with a more recent sphinx version, but this requires further updates to other packages and the configuration file: #2573 (comment) I had planned to do this in the summer, but have been quite busy with more important tasks. I will try to find some time in the next weeks.