requirements-test: Remove pytest pinning to < 7
pytest-postgresql 3.1.3
and pytest-redis 2.4.0
added support for pytest >= 7
so we can now drop the pytest pinning.
We also need to remove that pinning in all swh modules, using mr run sed -i 's/^pytest <.*$/pytest/' requirements-test.txt
will do the trick.
Migrated from D7515 (view on Phabricator)