misc: Remove (object) in class definitions

[EdCaunt]

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[georgebisbas]

Can you also remove it from:

class xxxx(object, yyy)?

[codecov]

Codecov Report

Attention: Patch coverage is 91.71598% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 86.81%. Comparing base (ffd8ee0) to head (cf509f9).

Files	Patch %	Lines
tests/test_gpu_common.py	0.00%	8 Missing ⚠️
tests/test_gpu_openacc.py	0.00%	3 Missing ⚠️
tests/test_gpu_openmp.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2378   +/-   ##
=======================================
  Coverage   86.81%   86.81%           
=======================================
  Files         233      233           
  Lines       43759    43759           
  Branches     8076     8076           
=======================================
  Hits        37990    37990           
  Misses       5061     5061           
  Partials      708      708           

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[FabioLuporini]

LGTM