Make Container extend DefaultByteBufHolder

Implementing ReferenceCounted with delegation doesn't quite work, as the
methods returning ReferenceCounted are not overriden to return
Container. This can cause code inside Netty to unintentionally unwrap
the Container.

Signed-off-by: Graham <gpe@openrs2.dev>

archive/src/main/java/dev/openrs2/archive/cache/CacheImporter.kt

@@ -12,7 +12,7 @@ import dev.openrs2.db.Database
 import io.netty.buffer.ByteBuf
 import io.netty.buffer.ByteBufAllocator
 import io.netty.buffer.ByteBufUtil
-import io.netty.util.ReferenceCounted
+import io.netty.buffer.DefaultByteBufHolder
 import java.io.IOException
 import java.sql.Connection
 import java.sql.Types
@@ -25,8 +25,8 @@ public class CacheImporter @Inject constructor(
     private val alloc: ByteBufAllocator
 ) {
     private abstract class Container(
-        private val data: ByteBuf
-    ) : ReferenceCounted by data {
+        data: ByteBuf
+    ) : DefaultByteBufHolder(data) {
         val bytes: ByteArray = ByteBufUtil.getBytes(data, data.readerIndex(), data.readableBytes(), false)
         val crc32 = data.crc32()
         val whirlpool = Whirlpool.whirlpool(bytes)