chore(deps): update Kotlin to 2.2.21

Author: renovate[bot]

gradle/libs.versions.toml

@@ -3,12 +3,12 @@ agp = "8.13.0"
 commonsLang3 = "3.19.0"
 desugar_jdk_libs = "2.1.5"
 icu4j = "77.1"
-kotlin = "2.2.20"
+kotlin = "2.2.21"
 coreKtx = "1.17.0"
 junit = "4.13.2"
 junitVersion = "1.3.0"
 espressoCore = "3.7.0"
-kotlinTest = "2.2.20"
+kotlinTest = "2.2.21"
 lifecycleRuntimeKtx = "2.9.4"
 activityCompose = "1.11.0"
 composeBom = "2025.09.00"