fix(deps): update kotest to v6

Author: renovate[bot]

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ fabric-api = "0.42.0+1.16"
 fabric-yarn = "1.16.5+build.10"
 fabric-kotlin = "1.12.3+kotlin.2.0.21"
 asm = "9.9.1"
-kotest = "5.9.1"
+kotest = "6.1.2"
 
 [libraries]
 minecraft = { group = "com.mojang", name = "minecraft", version.ref = "minecraft" }