Fix isort error in utils.pyx

[charlesbluca]

Not sure if it was the timing of the gpuCI isort bump relative to the updated pre-commit hooks here, but #8749 introduced a sorting error in utils.pyx that wasn't caught by gpuCI at the time of merging.

[galipremsagar]

@gpucibot merge

[codecov]

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@@               Coverage Diff               @@
##             branch-21.08    #8771   +/-   ##
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  Coverage                ?   10.53%           
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  Files                   ?      116           
  Lines                   ?    18913           
  Branches                ?        0           
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  Hits                    ?     1993           
  Misses                  ?    16920           
  Partials                ?        0           

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