refactor: bump bungeecord version

Author: FllipEis

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ cloud-core = "2.0.0"
 cloud-velocity = "2.0.0-beta.10"
 cloud-bungeecord = "2.0.0-beta.10"
 velocity = "3.4.0-SNAPSHOT"
-bungeecord-api = "1.21-R0.1-SNAPSHOT"
+bungeecord-api = "1.21-R0.4"
 adventure-api = "4.17.0"
 adventure-platform-bungeecord = "4.3.4"
 adventure-text-minimessage = "4.17.0"