[K/N] Advance deprecation level of subarrayContentToString to ERROR

kotlin-native/runtime/src/main/kotlin/kotlin/collections/ArrayList.kt

@@ -160,7 +160,7 @@ actual class ArrayList<E> private constructor(
     }
 
     override fun toString(): String {
-        @Suppress("DEPRECATION")
+        @Suppress("DEPRECATION_ERROR")
         return array.subarrayContentToString(offset, length)
     }
 

kotlin-native/runtime/src/main/kotlin/kotlin/collections/Arrays.kt

@@ -23,7 +23,8 @@ internal fun checkCopyOfRangeArguments(fromIndex: Int, toIndex: Int, size: Int)
  * Returns a string representation of the contents of the subarray of the specified array as if it is [List].
  */
 @kotlin.internal.InlineOnly
-@Deprecated("This function will become internal soon.", level = DeprecationLevel.WARNING)
+@Deprecated("This function will become internal soon.")
+@DeprecatedSinceKotlin(warningSince = "1.4", errorSince = "1.5")
 public inline fun <T> Array<out T>.subarrayContentToString(offset: Int, length: Int): String {
     val sb = StringBuilder(2 + length * 3)
     sb.append("[")