switch tensorflow for macOS

[lkarthee]

tensorflow-cpu is not available for macOS, hence switch to tensorflow

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.47%. Comparing base (76118ac) to head (5fd1ae2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #19664      +/-   ##
==========================================
- Coverage   78.38%   73.47%   -4.92%     
==========================================
  Files         498      498              
  Lines       45524    45524              
  Branches     8396     8396              
==========================================
- Hits        35686    33448    -2238     
- Misses       8100    10413    +2313     
+ Partials     1738     1663      -75     

Flag	Coverage Δ
keras	73.35% <ø> (-4.89%)	⬇️
keras-jax	?
keras-numpy	56.33% <ø> (ø)
keras-tensorflow	63.37% <ø> (ø)
keras-torch	62.02% <ø> (ø)

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