Fix JoinTypes.__dict__ empty python 3.13

[LucaMarconato]

Hotfix for #852

[LucaMarconato]

Ah no, I see that multiscale-spatial-image does not support Python 3.13: https://github.com/spatial-image/multiscale-spatial-image/blob/main/pyproject.toml.

I missed this when I made this PR: #840. We need either to revert that PR or to check if multiscale-spatial-image can support Python 3.13. I tracked this here: spatial-image/multiscale-spatial-image#104.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.95%. Comparing base (7c280b7) to head (bc5a917).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #853   +/-   ##
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  Coverage   91.95%   91.95%           
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  Files          47       47           
  Lines        7293     7293           
=======================================
  Hits         6706     6706           
  Misses        587      587           

Files with missing lines	Coverage Δ
src/spatialdata/_core/query/relational_query.py	90.78% <100.00%> (ø)