add strict asyncio_mode in pytest.ini

Fix deprecated asyncio_mode legacy pytest warnings

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Migrated from D7767 (view on Phabricator)

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Patch application report for D7767 (id=28100)

Rebasing onto 5208aaf1...

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commit f9919fa8af246ea902169b07c8ed25e76038f33a
Author: Pratyush Desai <pratyush.desai@liberta.casa>
Date:   Mon May 9 12:13:27 2022 +0200

    add strict asyncio_mode in pytest.ini

See https://jenkins.softwareheritage.org/job/DCIDX/job/tests-on-diff/219/ for more details.

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