fix(punishment): use package-private main to match project convention

Java 25 doesn't require public on main methods. Other services like
FriendService use package-private, so match the existing pattern.

Author: Swofty-Developments

service.punishment/src/main/java/net/swofty/service/punishment/PunishmentService.java

@@ -10,7 +10,7 @@
 
 public class PunishmentService implements SkyBlockService {
 
-    public static void main(String[] args) {
+    static void main(String[] args) {
         String mongoUri = ConfigProvider.settings().getMongodb();
         new PunishmentDatabase(null).connect(mongoUri);
         SkyBlockService.init(new PunishmentService());