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MINOR: [Python] try harder to set up s3_server fixture (#41754)

In conda-forge, when running the aarch tests in emulation, we regularly run into the [issue](https://github.com/conda-forge/pyarrow-feedstock/issues/117) that the fixture setup fails. Extending the timeouts fixes this. Since it only happens once per session, it doesn't hurt to take a little bit more time.

Authored-by: H. Vetinari <h.vetinari@gmx.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>