Suppress the different base classes warning for RawSink

Author: fzhinkin

core/jvm/src/RawSink.kt

@@ -22,7 +22,8 @@ package kotlinx.io
 
 import java.io.Flushable
 
-@OptIn(ExperimentalStdlibApi::class)
+@AllowDifferentMembersInActual
+@OptIn(ExperimentalStdlibApi::class, ExperimentalMultiplatform::class)
 public actual interface RawSink : AutoCloseableAlias, Flushable {
     public actual fun write(source: Buffer, byteCount: Long)