Update kotest to v5.8.1

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-kotest = "5.5.5"
+kotest = "5.8.1"
 
 [libraries]
 kotest-runner-junit5 = { module = "io.kotest:kotest-runner-junit5", version.ref = "kotest" }