Update Kotlin (#135)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ apollo_version = "4.0.0-beta.7"
 coil_version = "2.7.0"
 coroutines_version = "1.9.0"
 hilt_version = "2.50"
-kotlin_version = "2.0.20"
+kotlin_version = "2.0.21"
 media3_version = "1.4.1"
 voyager_version = "1.0.0"
 
@@ -14,7 +14,7 @@ android-application = { id = "com.android.application", version = "8.7.0" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin_version" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin_version" }
 kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin_version" }
-ksp = { id = "com.google.devtools.ksp", version = "2.0.20-1.0.25" }
+ksp = { id = "com.google.devtools.ksp", version = "2.0.21-1.0.25" }
 
 aboutLibraries = { id = "com.mikepenz.aboutlibraries.plugin", version.ref = "aboutlib_version" }
 apollo = { id = "com.apollographql.apollo3", version.ref = "apollo_version" }