ReflectionUtils - remove unneeded packageVersion field

- Paper stopped using craftbukkit relocation and this line causes errors in 1.20.5

src/main/java/net/skripthub/docstool/utils/ReflectionUtils.java

@@ -4,16 +4,12 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 
-import org.bukkit.Bukkit;
-
 /**
  * Just a simple reflection class, just to not depend on Skript 2.2+ (I think it is the only thing I use from it)
  * @author Tuke_Nuke
  */
 public class ReflectionUtils {
 
-    public static final String packageVersion = Bukkit.getServer().getClass().getPackage().getName().split(".v")[1];
-
     /**
      * Check if a class exists.
      * @param clz - The class path, like 'org.bukkit.entity.Player'
@@ -164,4 +160,4 @@ public static <T> T getField(Class<?> from, Object obj, String field){
         return null;
 
     }
-}
+}