Bump cloud.google.com/go/compute/metadata from 0.4.0 to 0.5.1 in /prometheus-to-sd#779

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dependabot/go_modules/prometheus-to-sd/cloud.google.com/go/compute/metadata-0.5.1GoogleCloudPlatform/k8s-stackdriver:dependabot/go_modules/prometheus-to-sd/cloud.google.com/go/compute/metadata-0.5.1Copy head branch name to clipboard