Update kotlin monorepo to v1.8.20

Author: renovate[bot]

gradle/libs.versions.toml

@@ -19,7 +19,7 @@ jetbrainsAppleGradlePlugin = "222.3345.143-0.19"
 jetbrainsComposeCompiler = "1.4.0"
 jetbrainsCompose = "1.3.0"
 koin = "3.4.2"
-kotlin = "1.8.0"
+kotlin = "1.8.20"
 kotlinx-coroutines = "1.6.4"
 kotlinx-serialization = "1.5.0"
 ktor = "2.2.3"