fix: bump kotlinx-datetime to 0.7.1, scope ExperimentalTime opt-in to saveEvents

composeApp/src/commonMain/kotlin/ch/parano/myice/cache/ScheduleCache.kt

@@ -7,7 +7,6 @@ import kotlin.time.ExperimentalTime
 import kotlinx.serialization.builtins.ListSerializer
 import kotlinx.serialization.json.Json
 
-@OptIn(ExperimentalTime::class)
 class ScheduleCache(private val settings: Settings) {
 
     private val json = Json { ignoreUnknownKeys = true }
@@ -19,6 +18,7 @@ class ScheduleCache(private val settings: Settings) {
     private fun typeFilterKey(account: String) = "filters_typefilter_$account"
     private fun timestampKey(account: String) = "cached_events_timestamp_$account"
 
+    @OptIn(ExperimentalTime::class)
     fun saveEvents(account: String, events: List<Event>) {
         settings.putString(eventsKey(account), json.encodeToString(eventListSerializer, events))
         settings.putLong(timestampKey(account), Clock.System.now().toEpochMilliseconds())