fix: wrap OutputStream in WritableByteChannel for transferTo

src/main/java/com/dostalgia/StaticResource.java

@@ -167,7 +167,7 @@ public class StaticResource {
         public void write(OutputStream output) throws IOException {
             try (FileChannel ch = FileChannel.open(file, StandardOpenOption.READ)) {
                 if (length > 0) {
-                    ch.transferTo(offset, length, output);
+                    ch.transferTo(offset, length, java.nio.channels.Channels.newChannel(output));
                 }
             }
         }