Adding build failed fixes.

Author: the-yash-rajput

src/main/java/com/thealgorithms/graph/TopologicalSort.java

@@ -16,11 +16,6 @@
  */
 public final class TopologicalSort {
 
-    // Prevent instantiation
-    private TopologicalSort() {
-        throw new AssertionError("Cannot instantiate utility class");
-    }
-
     /**
      * Class that represents a directed graph and provides methods for
      * manipulating the graph