add strict asyncio_mode in pytest.ini

Fix deprecated asyncio_mode legacy pytest warnings

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Migrated from D7791 (view on Phabricator)

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Patch application report for D7791 (id=28124)

Rebasing onto 1a9164fc...

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commit 922a1ea0aad17bb473f9c968dea079eaad9c22e6
Author: Pratyush Desai <pratyush.desai@liberta.casa>
Date:   Mon May 9 12:14:19 2022 +0200

    add strict asyncio_mode in pytest.ini

See https://jenkins.softwareheritage.org/job/DVAU/job/tests-on-diff/231/ for more details.

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