Address some build warnings

app/src/main/java/eu/kanade/tachiyomi/util/lang/CoroutinesExtensions.kt

@@ -14,6 +14,6 @@ fun launchUI(block: suspend CoroutineScope.() -> Unit): Job =
 fun launchIO(block: suspend CoroutineScope.() -> Unit): Job =
         GlobalScope.launch(Dispatchers.IO, CoroutineStart.DEFAULT, block)
 
-@UseExperimental(ExperimentalCoroutinesApi::class)
+@OptIn(ExperimentalCoroutinesApi::class)
 fun launchNow(block: suspend CoroutineScope.() -> Unit): Job =
         GlobalScope.launch(Dispatchers.Main, CoroutineStart.UNDISPATCHED, block)

app/src/main/java/eu/kanade/tachiyomi/util/lang/StringExtensions.kt

@@ -44,7 +44,7 @@ fun String.byteSize(): Int {
  * Returns a string containing the first [n] bytes from this string, or the entire string if this
  * string is shorter.
  */
-@UseExperimental(ExperimentalStdlibApi::class)
+@OptIn(ExperimentalStdlibApi::class)
 fun String.takeBytes(n: Int): String {
     val bytes = toByteArray(Charsets.UTF_8)
     return if (bytes.size <= n) {