style: enable HideUtilityClassConstructor in checkstyle (#5147)

src/main/java/com/thealgorithms/maths/AliquotSum.java

@@ -9,7 +9,9 @@ import java.util.stream.IntStream;
  * are not equal to 15) are 1, 3 and 5, so the aliquot sum of 15 is 9 i.e. (1 +
  * 3 + 5). Wikipedia: https://en.wikipedia.org/wiki/Aliquot_sum
  */
-public class AliquotSum {
+public final class AliquotSum {
+    private AliquotSum() {
+    }
 
     /**
      * Finds the aliquot sum of an integer number.