Fix serialization issue in old version for mc server test

[rom1504]

1. mc-server 1.12.2v
   kicks clients when invalid credentials:
   Uncaught RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range. It must be >= 0 and <= 45. Received -847077210
   at new NodeError (node:internal/errors:405:5)
   at boundsError (node:internal/buffer:88:9)
   at Buffer.readUInt8 (node:internal/buffer:254:5)
   at readVarInt (node_modules/protodef/src/datatypes/utils.js:68:22)
   at Splitter._transform (src/transforms/framing.js:63:30)
   at Transform._write (node_modules/readable-stream/lib/internal/streams/transform.js:153:8)

[rom1504]

fyi @extremeheat

[rom1504]

I think this is likely caused by recent node protodef changes https://github.com/ProtoDef-io/node-protodef/commits/master/

[extremeheat]

Only change in ProtoDef was how the compiler inlined anonymous containers (treats them as normal containers then merges object into parent), so I don't think it would affect anything big.

Would need to see what packet specifically is causing the error and the dumped buffer to reproduce (the stack trace here is limited to only a few lines it seems)

[rom1504]

ProtoDef-io/node-protodef@fcf3ca0 was also recently released

[rom1504]

PrismarineJS/mineflayer#3492 mentions packet advancement

[rom1504]

For 1.21 wonder if it could be https://github.com/PrismarineJS/node-minecraft-protocol/blob/master/src/datatypes/compiler-minecraft.js#L44