Minor update

Author: MatKuhr

foundation-models/openai/src/test/java/com/sap/ai/sdk/foundationmodels/openai/IterableStreamConverterTest.java

@@ -23,7 +23,7 @@
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
-public class IterableStreamConverterTest {
+class IterableStreamConverterTest {
   @SneakyThrows
   @Test
   @DisplayName("Stream is fully consumed")