chore(deps): update net.md-5:bungeecord-api to v1.21-R0.2

Author: renovate[bot]

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ adventure-platform = "4.3.4"
 
 # Platforms
 bukkit = "1.20.2-R0.1-SNAPSHOT"
-bungeecord = "1.20-R0.3-SNAPSHOT"
+bungeecord = "1.21-R0.2"
 nukkit = "1.0-SNAPSHOT"
 sponge = "10.0.0"
 velocity = "3.2.0-SNAPSHOT"