chore(deps): update dependency io.kotest:kotest-assertions-core-jvm to v6.1.8 (#987)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 alchemist = "43.0.22"
-kotest = "6.1.7"
+kotest = "6.1.8"
 
 [libraries]
 alchemist = { module = "it.unibo.alchemist:alchemist", version.ref = "alchemist" }