api: fix sinc interp gridpoints

[mloubout]

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[codecov]

Codecov Report

❌ Patch coverage is 90.07634% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.64%. Comparing base (47b8c41) to head (9bab331).

Files with missing lines	Patch %	Lines
tests/test_mpi.py	18.18%	9 Missing ⚠️
devito/operations/interpolators.py	94.80%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3006      +/-   ##
==========================================
- Coverage   83.66%   83.64%   -0.03%     
==========================================
  Files         257      257              
  Lines       54554    54610      +56     
  Branches     4685     4682       -3     
==========================================
+ Hits        45644    45678      +34     
- Misses       8100     8119      +19     
- Partials      810      813       +3     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.53% <72.72%> (+0.01%)	⬆️
pytest-gpu-gcc-	78.27% <90.07%> (-0.02%)	⬇️
pytest-gpu-icx-	78.22% <90.07%> (-0.02%)	⬇️
pytest-gpu-nvc-nvidiaX	69.17% <72.72%> (+0.02%)	⬆️

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