fix: bungeecord version

Author: FllipEis

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 kotlin = "2.1.20"
 kotlin-coroutines = "1.10.2"
 velocity = "3.4.0-SNAPSHOT"
-bungeecord = "1.20-R0.2-SNAPSHOT"
+bungeecord = "1.21-R0.4"
 shadow = "8.3.3"
 simplecloud-controller = "0.0.30-SNAPSHOT.05b51cb"
 simplecloud-player = "0.0.1-SNAPSHOT.69b65f6"