Update nvcr.io/nvidia/cloud-native/gpu-operator-validator Docker tag to v25.3.1

This MR contains the following updates:

Package	Type	Update	Change
nvcr.io/nvidia/cloud-native/gpu-operator-validator	ironbank-docker	patch	v25.3.0 -> v25.3.1
nvcr.io/nvidia/cloud-native/gpu-operator-validator	stage	patch	v25.3.0 -> v25.3.1

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