fix: Hang in multi-chunk DataFrame .rows()

[orlp]

Fixes #25573.

We didn't release the GIL when rechunking and I guess that creates a deadlock. This seems to fix it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.81%. Comparing base (8035d57) to head (619c50d).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25582      +/-   ##
==========================================
+ Coverage   79.57%   79.81%   +0.23%     
==========================================
  Files        1729     1729              
  Lines      239636   239686      +50     
  Branches     3032     3038       +6     
==========================================
+ Hits       190689   191298     +609     
+ Misses      48165    47605     -560     
- Partials      782      783       +1     

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