Allows downgrades in NCCL installation.
Allows downgrades in NCCL installation.

PiperOrigin-RevId: 378403997

GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker