fix(deps): bump github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric from 0.59.0 to 0.60.0 in /api

fix(deps): bump github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric from 0.59.0 to 0.60.0 in /api #408