Update gcloud auth for build-amdvlk-docker
Update gcloud auth for build-amdvlk-docker

The old auth methods are now deprecated and started producing warnings.

Fixes: https://github.com/GPUOpen-Drivers/llpc/issues/1569

GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc