conftest: Explicitely declare aiohttp pytest plugin use

And remove pytest-aiohttp test dependency to avoid error related to double loading of the plugin when pytest is invoked (see swh-core!188 (closed) for more details).

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commit 29db82c6504724f5afac849cf225dda67dc7d05f
Author: Antoine Lambert <antoine.lambert@inria.fr>
Date:   Thu Nov 19 17:51:10 2020 +0100

    conftest: Explicitely declare aiohttp pytest plugin use
    
    And remove pytest-aiohttp test dependency to avoid error related to double
    loading of the plugin when pytest is invoked.

See https://jenkins.softwareheritage.org/job/DVAU/job/tests-on-diff/52/ for more details.

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