fix: linter order

Author: S-M-J-I

src/test/java/com/thealgorithms/stacks/GreatestElementConstantTimeTest.java

@@ -1,8 +1,8 @@
 package com.thealgorithms.stacks;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import java.util.NoSuchElementException;
 import org.junit.jupiter.api.BeforeEach;

src/test/java/com/thealgorithms/stacks/SmallestElementConstantTimeTest.java

@@ -1,8 +1,8 @@
 package com.thealgorithms.stacks;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import java.util.NoSuchElementException;
 import org.junit.jupiter.api.BeforeEach;