fix(exporter-logs-otlp-grpc): make test server use port 1503 (#3842)

Author: pichlermarc

experimental/packages/exporter-logs-otlp-grpc/test/OTLPLogExporter.test.ts

@@ -44,7 +44,7 @@ const includeDirs = [
   path.resolve(__dirname, '../../otlp-grpc-exporter-base/protos'),
 ];
 
-const address = 'localhost:1501';
+const address = 'localhost:1503';
 
 type TestParams = {
   useTLS?: boolean;