Fix memoryview type being returned by SmaxInt<n>.data

[PaulKGrimes]

Numpy Ints have a property called .data, that returns a memory view of the object, rather than the object itself. The order of inheritance in defining SmaxInt led to the SmaxVarBase .data property being overwritten by this property. It had already been fixed in SmaxFloats, but not SmaxInts.

This patches smax_data_types.py to ensure the correct .data property is returned. A note should be added to the documentation that this overrides the numpy base .data memoryview.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.05128% with 7 lines in your changes missing coverage. Please review.

Project coverage is 49.85%. Comparing base (8bb160c) to head (39efb3d).

Files with missing lines	Patch %	Lines
src/smax/smax_data_types.py	80.55%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
+ Coverage   48.80%   49.85%   +1.04%     
==========================================
  Files           5        5              
  Lines        1635     1671      +36     
==========================================
+ Hits          798      833      +35     
- Misses        837      838       +1     

Flag	Coverage Δ
unittests	49.85% <82.05%> (+1.04%)	⬆️

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