fix(VirtualStream): Ensure writable streams are correctly closed asynchronously to prevent potential sync issues.

ts/classes.virtualstream.ts

@@ -404,7 +404,7 @@ export class VirtualStream<T = Uint8Array> implements plugins.typedRequestInterf
     while(this.keepAlive || this.receiveBackpressuredArray.checkHasItems()) {
       const value = await this.fetchData();
       if (value === closingBit) {
-        writableStreamArg.close();
+        await writableStreamArg.close();
         break;
       }
       await writer.write(value);