update lavaplayer to 1.5.6

remove testbot since it doesn't compile anymore

Author: topi314

Testbot/build.gradle.kts

@@ -2,9 +2,7 @@ rootProject.name = "Lavalink-Parent"
 
 include(":Lavalink-Server")
 include(":protocol")
-include(":Testbot")
 include(":plugin-api")
-include("plugin-api")
 
 project(":Lavalink-Server").projectDir = file("$rootDir/LavalinkServer")
 
@@ -38,7 +36,7 @@ fun VersionCatalogBuilder.spring() {
 }
 
 fun VersionCatalogBuilder.voice() {
-    version("lavaplayer", "1.5.4")
+    version("lavaplayer", "1.5.6")
 
     library("lavaplayer",            "dev.arbjerg", "lavaplayer").versionRef("lavaplayer")
     library("lavaplayer-ip-rotator", "dev.arbjerg", "lavaplayer-ext-youtube-rotator").versionRef("lavaplayer")