[ci skip] Deprecate Server#setSpawnRadius (#12024)

paper-api/src/main/java/org/bukkit/Bukkit.java

@@ -1373,7 +1373,11 @@ public final class Bukkit {
      * Sets the radius, in blocks, around each worlds spawn point to protect.
      *
      * @param value new spawn radius, or 0 if none
+     * @deprecated has not functioned for a long time as the spawn radius is defined by the server.properties file.
+     * There is no API replacement for this method. It is generally recommended to implement "protection"-like behaviour
+     * via events or third-party plugin APIs.
      */
+    @Deprecated(since = "1.21.4", forRemoval = true)
     public static void setSpawnRadius(int value) {
         server.setSpawnRadius(value);
     }