Declare class as final

Author: Hardvan

src/main/java/com/thealgorithms/scheduling/NonPreemptivePriorityScheduling.java

@@ -9,7 +9,7 @@
  * executing,
  * it cannot be preempted.
  */
-public class NonPreemptivePriorityScheduling {
+public final class NonPreemptivePriorityScheduling {
 
     private NonPreemptivePriorityScheduling() {
     }