Fix niGSC tests for new qibo version

[wilkensJ]

Fixes issue #377

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (sklearn_dep@6561122). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@              Coverage Diff               @@
##             sklearn_dep     #380   +/-   ##
==============================================
  Coverage               ?   54.12%           
==============================================
  Files                  ?       68           
  Lines                  ?     5367           
  Branches               ?        0           
==============================================
  Hits                   ?     2905           
  Misses                 ?     2462           
  Partials               ?        0           

Flag	Coverage Δ
unittests	54.12% <0.00%> (?)

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