build: bump madsim

[xxchan]

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What's changed and what's your intention?

I'm thinking whether #15722 (comment) is related with madsim

test_serving_cluster_availability�[0m�[35;1m ---�[0m
thread '<unnamed>' panicked at src/tests/simulation/tests/integration_tests/batch/mod.rs:138:31:
called `Result::unwrap_err()` on an `Ok` value:

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[xxchan]

cc @wangrunji0408 @zwang28

[xxchan]

BTW, madsim cannot compile with async-channel@2.3.0

[wangrunji0408]

I'm afraid we need to bisect madsim version between 0.22 and 0.27. 🥵

[xxchan]

I guess it's possibly related with sleep? BTW, @zwang28 pushed a new commit to change the test in #15722

[wangrunji0408]

cc @zwang28 Do you confirm the root cause of the failure? Wondering if it was simply caused by a different random number generated.