Migrate deprecated APIs from EpochAdapter

Signed-off-by: Gopal S Akshintala <gopala.akshintala@salesforce.com>

Author: overfullstack

src/main/kotlin/com/salesforce/revoman/internal/json/adapters/EpochAdapter.kt

@@ -11,10 +11,12 @@ import com.squareup.moshi.FromJson
 import com.squareup.moshi.JsonAdapter
 import com.squareup.moshi.JsonReader
 import java.util.Date
-import kotlinx.datetime.Instant
-import kotlinx.datetime.toJavaInstant
+import kotlin.time.ExperimentalTime
+import kotlin.time.Instant
+import kotlin.time.toJavaInstant
 
 object EpochAdapter {
+  @OptIn(ExperimentalTime::class)
   @FromJson
   fun fromJson(reader: JsonReader, delegate: JsonAdapter<Date>): Date? {
     val epoch = reader.nextString()