Update plugin/grpctrace/interceptor_test.go
Update plugin/grpctrace/interceptor_test.go

Co-authored-by: Tyler Yahn <b79042b10fd9cd75597e3dac7c4e4fe9e14fe996@users.noreply.github.com>
open-telemetry/opentelemetry-go,open-telemetry/opentelemetry-go