checkstyle: fix "avoid *"

Author: alxkm

src/test/java/com/thealgorithms/datastructures/bag/BagTest.java

@@ -1,6 +1,10 @@
 package com.thealgorithms.datastructures.bag;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
 
 import com.thealgorithms.datastructures.bags.Bag;
 import java.util.Iterator;