Update dependency io.kotest:kotest-assertions-core-jvm to v6

Author: renovate[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ clikt = "5.1.0"
 gradle-api = "8.11.1"
 junit-jupiter = "5.11.4"
 kctfork = "0.7.1"
-kotest = "4.6.4"
+kotest = "6.2.1"
 kotlin = "2.2.0"
 kotlinx-serialization = "1.11.0"
 lombok = "1.18.46"