Marques score assertion errors

[samwinebrake]

Score assertion errors are present within the marques2020 benchmark tests. See below for an example:

brainscore_vision/benchmarks/marques2020/test.py:68 (test_Marques2020[Marques2020_Cavanaugh2002-grating_summation_field-expected0])
<xarray.Score ()>
array(0.77613597)
Attributes:
    error:    0.024806444383184106
    raw:      [0.79613484 0.76925312 0.7953668  0.77673325 0.79324324 0.76894... != 0.599 ± 1.0e-02

<Click to see difference>

benchmark = 'Marques2020_Cavanaugh2002-grating_summation_field'
expected = 0.599 ± 1.0e-02

Also, to get to the point of having this test run, --target8.00--sourceNone must be stripped from the stimuli.identifer.