Update kotlin

Author: renovate[bot]

gradle/libs.versions.toml

@@ -15,9 +15,9 @@ firebaseAnalytics = "22.3.0"
 googleGmsGoogleServices = "4.4.2"
 hiltAndroid = "2.55"
 javaxInject = "1"
-kotlin = "2.1.10"
-kotlinxSerializationJson = "1.8.0"
-kspVersion = "2.1.10-1.0.31"
+kotlin = "2.1.21"
+kotlinxSerializationJson = "1.8.1"
+kspVersion = "2.1.21-2.0.1"
 lifecycleRuntimeKtx = "2.8.7"
 material = "1.12.0"
 mavenPublish = "0.31.0"