JAVA-48056: Changes made for converting SimpleSingletonUnitTest to SimpleSingletonManualTest

Author: Bipinkumar27

patterns-modules/design-patterns-singleton/src/test/java/com/baeldung/threadsafe/SimpleSingletonUnitTest.java renamed to patterns-modules/design-patterns-singleton/src/test/java/com/baeldung/threadsafe/SimpleSingletonManualTest.java

@@ -8,7 +8,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-public class SimpleSingletonUnitTest {
+public class SimpleSingletonManualTest {
     @Test
     void givenUnsafeSingleton_whenAccessedConcurrently_thenMultipleInstancesCreated() throws InterruptedException {
         int threadCount = 1000;