HHH-9783 TestableLoggerProvider needs to implement a new method after upgrade of JBoss Logger

hibernate-testing/src/main/java/org/hibernate/testing/logger/TestableLoggerProvider.java

@@ -59,6 +59,11 @@ public class TestableLoggerProvider implements org.jboss.logging.LoggerProvider
 		return logger;
 	}
 
+	@Override
+	public void clearMdc() {
+		MDC.clear();
+	}
+
 	public Object getMdc(String key) {
 		return MDC.get( key );
 	}