Bump google.golang.org/api from 0.188.0 to 0.189.0 in /prometheus-to-sd#754

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dependabot/go_modules/prometheus-to-sd/google.golang.org/api-0.189.0GoogleCloudPlatform/k8s-stackdriver:dependabot/go_modules/prometheus-to-sd/google.golang.org/api-0.189.0Copy head branch name to clipboard