style: enable HideUtilityClassConstructor in checkstyle (#5147)

src/main/java/com/thealgorithms/ciphers/AES.java

@@ -7,7 +7,9 @@ import java.util.Scanner;
  * This class is build to demonstrate the application of the AES-algorithm on a
  * single 128-Bit block of data.
  */
-public class AES {
+public final class AES {
+    private AES() {
+    }
 
     /**
      * Precalculated values for x to the power of 2 in Rijndaels galois field.