Remove unused use of runtime in integration test

Author: ThomsonTan

opentelemetry-otlp/tests/integration_test/tests/logs.rs

@@ -8,7 +8,7 @@ use log::{info, Level};
 use opentelemetry_appender_log::OpenTelemetryLogBridge;
 use opentelemetry_otlp::LogExporter;
 use opentelemetry_sdk::logs::LoggerProvider;
-use opentelemetry_sdk::{logs as sdklogs, runtime, Resource};
+use opentelemetry_sdk::{logs as sdklogs, Resource};
 use std::fs::File;
 use std::os::unix::fs::MetadataExt;
 use std::time::Duration;