Update Kotlin monorepo

Author: renovate[bot]

gradle/libs.versions.toml

@@ -8,12 +8,12 @@ androidx-navigationCompose-multiplatform = "2.9.0-beta01"
 compose-multiplatform = "1.8.0"
 detekt = "1.23.8"
 java = "21"
-kotlin = "2.1.20"
+kotlin = "2.1.21"
 kotlinpoet-ksp = "2.2.0"
 kotlinx-coroutines = "1.10.2"
 kotlinx-io = "0.7.0"
 kotlinx-serialization = "1.8.1"
-ksp = "2.1.20-2.0.1"
+ksp = "2.1.21-2.0.1"
 maven-publish = "0.32.0"
 
 [libraries]