buffer: use Utf8LengthV2() instead of Utf8Length()

`Utf8Length()` is deprecated and was replaced during the V8 update, but a subsequent commit introduced a new occurrence. Refs: #58070 Refs: #58048 PR-URL: #58156 Reviewed-By: Gerhard Stöbich <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: tniessen

src/node_buffer.cc

@@ -742,7 +742,7 @@ uint32_t FastByteLengthUtf8(
  Local<String> sourceStr = sourceValue.As<String>();
 
 if (!sourceStr->IsExternalOneByte()){
-return sourceStr->Utf8Length(isolate);
+return sourceStr->Utf8LengthV2(isolate);
  }
 auto source = sourceStr->GetExternalOneByteStringResource();
 // For short inputs, the function call overhead to simdutf is maybe