palladum-lightning

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Rusty Russell b3b9d93fb0 pytest: fix flake in test_update_fee_reconnect.

If we grab l2's scratch_txid too early, it might not be the one which goes in the mempool:

```
2025-05-12T05:15:44.3947957Z     def test_update_fee_reconnect(node_factory, bitcoind):
...
2025-05-12T05:15:44.3962867Z         # Now shutdown cleanly.
2025-05-12T05:15:44.3963253Z         l1.rpc.close(chan)
2025-05-12T05:15:44.3963591Z     
2025-05-12T05:15:44.3963905Z         # And should put closing into mempool.
2025-05-12T05:15:44.3964671Z         l1.wait_for_channel_onchain(l2.info['id'])
2025-05-12T05:15:44.3965175Z >       l2.wait_for_channel_onchain(l1.info['id'])
2025-05-12T05:15:44.3965496Z 
2025-05-12T05:15:44.3965659Z tests/test_connection.py:2634: 
...
2025-05-12T05:15:44.3966616Z contrib/pyln-testing/pyln/testing/utils.py:1216: in wait_for_channel_onchain
2025-05-12T05:15:44.3967080Z     wait_for(lambda: txid in self.bitcoin.rpc.getrawmempool())
2025-05-12T05:15:44.3967429Z _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
2025-05-12T05:15:44.3967631Z 
2025-05-12T05:15:44.3967888Z success = <function LightningNode.wait_for_channel_onchain.<locals>.<lambda> at 0x7f0562d7f0a0>
2025-05-12T05:15:44.3968299Z timeout = 180
2025-05-12T05:15:44.3968408Z 
2025-05-12T05:15:44.3968515Z     def wait_for(success, timeout=TIMEOUT):
2025-05-12T05:15:44.3968805Z         start_time = time.time()
2025-05-12T05:15:44.3969041Z         interval = 0.25
2025-05-12T05:15:44.3969251Z         while not success():
2025-05-12T05:15:44.3969510Z             time_left = start_time + timeout - time.time()
2025-05-12T05:15:44.3969794Z             if time_left <= 0:
2025-05-12T05:15:44.3970278Z >               raise ValueError("Timeout while waiting for {}".format(success))
2025-05-12T05:15:44.3970894Z E               ValueError: Timeout while waiting for <function LightningNode.wait_for_channel_onchain.<locals>.<lambda> at 0x7f0562d7f0a0>
```

2025-05-14 12:19:10 +09:30