Update kotest to v5.9.0 (#42)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ kotlinGradle = "1.9.24"
 
 javaDiffUtils = "4.12"
 junit = "5.10.2"
-kotest = "5.8.1"
+kotest = "5.9.0"
 kotlinx-bcv = "0.13.2"
 
 gradlePluginPublishPlugin = "1.2.1"