Bump cloud.google.com/go/compute/metadata from 0.6.0 to 0.8.4 in /prometheus-to-sd#992

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dependabot/go_modules/prometheus-to-sd/cloud.google.com/go/compute/metadata-0.8.4GoogleCloudPlatform/k8s-stackdriver:dependabot/go_modules/prometheus-to-sd/cloud.google.com/go/compute/metadata-0.8.4Copy head branch name to clipboard