Update Helm release gpu-operator to v1.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
gpu-operator (source)	minor	v1.7.1 -> v1.8.1

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Release Notes

NVIDIA/gpu-operator

### [`v1.8.1`](https://togithub.com/NVIDIA/gpu-operator/releases/v1.8.1) [Compare Source](https://togithub.com/NVIDIA/gpu-operator/compare/v1.8.0...v1.8.1) https://docs.nvidia.com/datacenter/cloud-native/gpu-operator/release-notes.html ### [`v1.8.0`](https://togithub.com/NVIDIA/gpu-operator/releases/v1.8.0) [Compare Source](https://togithub.com/NVIDIA/gpu-operator/compare/v1.7.1...v1.8.0) https://docs.nvidia.com/datacenter/cloud-native/gpu-operator/release-notes.html

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