testnet bootnode is unreachable

```2024/12/19 05:41:16.825000 UTC INFO : [/network]: network.go:836: [<YOUR_LOGGINGID>] failed to connect to  (boot-public-testnet.thundercore.com:8888); err=read tcp 192.168.0.8:50036->15.197.215.140:8888: read: connection timed out```