Make the io_test more reliable (backport #9387)

[mergify]

Fixes: #9389

@v-davit-ioramashvili investigated what's happening on the macos runners and figured out that it takes approximately 35s for the port to start listening: actions/runner-images#14409 (comment). So the solution to the problem is fairly simple: wait for up to 90s before giving up and failing the test.

I've done a second thing in this PR, which is no longer necessary but should still help to make this test more reliable: rather than hardcoding a specific port number, the test searches for a free port. I wrote the code to search for a port before I found out the real reason why the test is failing, but I think we might as well keep it.

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This is an automatic backport of pull request #9387 done by Mergify.

[mergify]

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