Stabilize Char-to-Int conversions KT-45874

libraries/stdlib/js-v1/src/kotlin/charCode_js-v1.kt

@@ -10,8 +10,8 @@ package kotlin
  *
  * @sample samples.text.Chars.charFromCode
  */
-@ExperimentalStdlibApi
-@SinceKotlin("1.4")
+@SinceKotlin("1.5")
+@WasExperimental(ExperimentalStdlibApi::class)
 @kotlin.internal.InlineOnly
 public actual inline fun Char(code: UShort): Char {
     return code.toInt().toChar()