add strict asyncio_mode in pytest.ini

Fix deprecated asyncio_mode legacy pytest warnings. context

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Migrated from D7725 (view on Phabricator)

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Patch application report for D7725 (id=27935)

Rebasing onto ff980f49...

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commit f9717f3e7e7c2cc939256de90f106d32cab41835
Author: Pratyush Desai <pratyush.desai@liberta.casa>
Date:   Mon May 2 14:21:36 2022 +0200

    add strict asyncio_mode in pytest.ini

See https://jenkins.softwareheritage.org/job/DAUTH/job/tests-on-diff/90/ for more details.

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