Remove redundant @OptIn targeting new case conversion api

libraries/stdlib/js/src/generated/_TitlecaseMappings.kt

@@ -11,7 +11,6 @@ package kotlin.text
 //
 
 // 4 ranges totally
-@OptIn(ExperimentalStdlibApi::class)
 internal fun Char.titlecaseCharImpl(): Char {
     val code = this.code
     // Letters repeating <Lu, Lt, Ll> sequence and code of the Lt is a multiple of 3, e.g. <DŽ, Dž, dž>

libraries/stdlib/js/src/kotlin/text/numberConversions.kt

@@ -19,7 +19,6 @@ public actual inline fun String.toBoolean(): Boolean = this.toBoolean()
  *
  * There are also strict versions of the function available on non-nullable String, [toBooleanStrict] and [toBooleanStrictOrNull].
  */
-@OptIn(ExperimentalStdlibApi::class)
 @SinceKotlin("1.4")
 public actual fun String?.toBoolean(): Boolean = this != null && this.lowercase() == "true"
 
@@ -133,7 +132,6 @@ public actual inline fun Short.toString(radix: Int): String = this.toInt().toStr
 @SinceKotlin("1.2")
 public actual fun Int.toString(radix: Int): String = asDynamic().toString(checkRadix(radix))
 
-@OptIn(ExperimentalStdlibApi::class)
 private fun String.isNaN(): Boolean = when (this.lowercase()) {
     "nan", "+nan", "-nan" -> true
     else -> false

libraries/stdlib/js/src/kotlin/text/string.kt

@@ -240,7 +240,6 @@ public inline fun String.match(regex: String): Array<String>? = asDynamic().matc
 @kotlin.internal.InlineOnly
 internal inline fun String.nativeReplace(pattern: RegExp, replacement: String): String = asDynamic().replace(pattern, replacement)
 
-@OptIn(ExperimentalStdlibApi::class)
 @SinceKotlin("1.2")
 @Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
 public actual fun String.compareTo(other: String, ignoreCase: Boolean = false): Int {

libraries/stdlib/js/src/kotlin/text/stringsCode.kt

@@ -54,7 +54,6 @@ public fun String.matches(regex: String): Boolean {
 
 public actual fun CharSequence.isBlank(): Boolean = length == 0 || (if (this is String) this else this.toString()).matches("^[\\s\\xA0]+$")
 
-@OptIn(ExperimentalStdlibApi::class)
 @Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
 public actual fun String?.equals(other: String?, ignoreCase: Boolean = false): Boolean =
     when {