Update all dependencies to v2

| datasource | package                                                         | from   | to     |
| ---------- | --------------------------------------------------------------- | ------ | ------ |
| maven      | org.jetbrains.kotlin.jvm:org.jetbrains.kotlin.jvm.gradle.plugin | 1.9.23 | 2.0.20 |
| maven      | org.jetbrains.kotlin:kotlin-stdlib                              | 1.9.23 | 2.0.20 |
| maven      | org.jetbrains.kotlin:kotlin-scripting-compiler-embeddable       | 1.9.23 | 2.0.20 |

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 kotest = "5.8.1"
 kafka = "3.7.0"
-kotlin = "1.9.23"
+kotlin = "2.0.20"
 kotlinx-coroutines = "1.8.0"
 dokka = "1.9.20"
 knit = "0.5.0"