Support Elixir 1.18 in CI

[kianmeng]

No description provided.

[kianmeng]

Is this error intended in test?

$ mix test                                          
Generated flow app                                                                               
Running ExUnit with seed: 618358, max_cases: 16                                                  
                                                                                                 
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Finished in 1.7 seconds (1.7s async, 0.00s sync) 
26 doctests, 185 tests, 0 failures

$ mix test
Running ExUnit with seed: 907459, max_cases: 16

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20:30:33.439 [error] GenServer #PID<0.1885.0> terminating
** (stop) killed
Last message: {:EXIT, #PID<0.1884.0>, :killed}
State: %{supervisor: #PID<0.1886.0>, refs: [#Reference<0.1645831067.502267910.208626>, #Reference<0.1645831067.502267910.208627>, #Reference<0.1645831067.502267910.208628>, #Reference<0.1645831067.502267910.208629>], producers: [#PID<0.1887.0>], intermediary: [{#PID<0.1888.0>, [cancel: :transient]}, {#PID<0.1889.0>, [cancel: :transient]}, {#PID<0.1890.0>, [cancel: :transient]}, {#PID<0.1891.0>, [cancel: :transient]}]}
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Finished in 1.6 seconds (1.6s async, 0.00s sync)
26 doctests, 185 tests, 0 failures

[josevalim]

Yes, it is. We test in several places what happens when a process terminates. We may be missing a capture log but we do expect those scenarios!

[kianmeng]

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