Add private constructor to LongestIncreasingSubsequenceNLogN class to prevent instantiation

Author: huseynovvusal

src/main/java/com/thealgorithms/dynamicprogramming/LongestIncreasingSubsequenceNLogN.java

@@ -7,6 +7,8 @@
  * @author Vusal Huseynov (https://github.com/huseynovvusal)
  */
 public class LongestIncreasingSubsequenceNLogN {
+    private LongestIncreasingSubsequenceNLogN() {
+    }
 
     /**
      * Finds the index of the smallest element in the array that is greater than