Fix for FutureWarning: functools.partial ...

[selmanozleyen]

This is a minimal fix doing exactly what the warnings says and is backward compat. Here is an example of how the warnings look:

.venv/lib/python3.13/site-packages/spatialdata/_core/query/relational_query.py:532
  /Users/selman/projects/squidpy/.venv/lib/python3.13/site-packages/spatialdata/_core/query/relational_query.py:532: FutureWarning: functools.partial will be a method descriptor in future Python versions; wrap it in enum.member() if you want to preserve the old behavior
    left_exclusive = partial(_left_exclusive_join_spatialelement_table)

.venv/lib/python3.13/site-packages/spatialdata/_core/query/relational_query.py:533
  /Users/selman/projects/squidpy/.venv/lib/python3.13/site-packages/spatialdata/_core/query/relational_query.py:533: FutureWarning: functools.partial will be a method descriptor in future Python versions; wrap it in enum.member() if you want to preserve the old behavior
    inner = partial(_inner_join_spatialelement_table)

.venv/lib/python3.13/site-packages/spatialdata/_core/query/relational_query.py:534
  /Users/selman/projects/squidpy/.venv/lib/python3.13/site-packages/spatialdata/_core/query/relational_query.py:534: FutureWarning: functools.partial will be a method descriptor in future Python versions; wrap it in enum.member() if you want to preserve the old behavior
    right = partial(_right_join_spatialelement_table)

.venv/lib/python3.13/site-packages/spatialdata/_core/query/relational_query.py:535
  /Users/selman/projects/squidpy/.venv/lib/python3.13/site-packages/spatialdata/_core/query/relational_query.py:535: FutureWarning: functools.partial will be a method descriptor in future Python versions; wrap it in enum.member() if you want to preserve the old behavior
    right_exclusive = partial(_right_exclusive_join_spatialelement_table)

ping: @LucaMarconato

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.94%. Comparing base (cdf3435) to head (dadf411).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1076   +/-   ##
=======================================
  Coverage   91.94%   91.94%           
=======================================
  Files          51       51           
  Lines        7673     7673           
=======================================
  Hits         7055     7055           
  Misses        618      618           

Files with missing lines	Coverage Δ
src/spatialdata/_core/query/relational_query.py	91.61% <100.00%> (ø)

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[melonora]

Cheers, just changed the commit message to be more informative. Will merge when tests pass.