Update Perlmutter platform detection

[shuds13]

SLURM GPU partitions seem to be renamed, this accounts for that.

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (5f91d2d) 72.12% compared to head (6131035) 72.17%.
Report is 6 commits behind head on develop.

Files	Patch %	Lines
libensemble/gen_funcs/persistent_gpCAM.py	0.00%	12 Missing ⚠️
libensemble/resources/platforms.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1211      +/-   ##
===========================================
+ Coverage    72.12%   72.17%   +0.04%     
===========================================
  Files           92       92              
  Lines         8234     8243       +9     
  Branches      1465     1466       +1     
===========================================
+ Hits          5939     5949      +10     
- Misses        2039     2042       +3     
+ Partials       256      252       -4     

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