api: fixup complex dtype handling for mpi

[mloubout]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 59.09091% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.56%. Comparing base (3f5eb5f) to head (28b9d54).

Files with missing lines	Patch %	Lines
tests/test_mpi.py	22.22%	7 Missing ⚠️
devito/tools/dtypes_lowering.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2966      +/-   ##
==========================================
- Coverage   83.56%   83.56%   -0.01%     
==========================================
  Files         257      257              
  Lines       53526    53538      +12     
  Branches     4583     4584       +1     
==========================================
+ Hits        44730    44737       +7     
- Misses       8004     8009       +5     
  Partials      792      792              

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.37% <61.53%> (-0.02%)	⬇️
pytest-gpu-gcc-	78.39% <59.09%> (-0.01%)	⬇️
pytest-gpu-icx-	78.32% <59.09%> (-0.01%)	⬇️
pytest-gpu-nvc-nvidiaX	69.03% <61.53%> (-0.01%)	⬇️

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