chore: upgrade dependencies and fix pytest-asyncio deprecated code (#305)

Upgrade dependencies to their latest versions, including update of `pytext-asyncio` from 0.25.3 to 1.1.0.
`pytest-asyncio` >= 1.0 has some breaking changes, including the deprecation of `event_loop`, which makes the testing of async features more easy and less verbose, but need some code adaptation to remove `event_loop`.

Detail:
- https://pytest-asyncio.readthedocs.io/en/latest/reference/changelog.html
- pytest-dev/pytest-asyncio#1106

Author: bolinocroustibat