checkstyle: fix formatting

Author: alxkm

src/test/java/com/thealgorithms/datastructures/stacks/LinkedListStackTest.java

@@ -4,11 +4,10 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.util.NoSuchElementException;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import java.util.NoSuchElementException;
-
 public class LinkedListStackTest {
 
     private LinkedListStack stack;