`brev ls` doesn't show a GPU in the GPU column for all providers

[brycelelbach]

You have 8 instances in Org ...
 NAME                            STATUS   BUILD      SHELL  ID         MACHINE             GPU
 gr-ach100                       RUNNING  COMPLETED  READY  59b......  hyperstack_H100     H100
 gr-llmc-l40s                    RUNNING  COMPLETED  READY  m77......  massedcompute_L40S  -
 gr-matmul-l40s                  RUNNING  COMPLETED  READY  9rd......  massedcompute_L40S  -
 ...

Those L40S instances don't list a GPU in the GPU column.