Add missing newline at end of TopologicalSort class

Author: the-yash-rajput

src/test/java/com/thealgorithms/graph/TopologicalSortTest.java

@@ -1,14 +1,14 @@
 package com.thealgorithms.graph;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 import java.util.Arrays;
 import java.util.List;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-
 /**
  * Test class for TopologicalSort
  * Achieves 100% code coverage