Mysqli test cases using fake_server are flaky

[cmb69]

Description

I've just stumbled upon https://github.com/php/php-src/actions/runs/11942808872/job/33290600427. The test uses port 50001 which is otherwise not explicitly used by the php-src test suite, but might be used by a test using an ephemeral port. I'm not sure, though, that a port collision is the cause of the test failure.

However, the other regression test for that issue all use port 33305 (which is also the default of the fake server); this is prone to collisions when running tests in parallel.

I think it's best to use ephemeral ports everywhere (see #6132).

PHP Version

PHP-8.4 (likely 8.1 - master)

Operating System

Windows (likely POSIX as well)

[cmb69]

Oh, just noticed that the mysqli test suite is marked as conflicting (mysql) anyway. So it's certainly not that bad. Still, there seems to be room for improvement, and at least the actual test failure mentioned above should be sorted out, ideally.