Update dependency pytest-asyncio to v0.20.1 (develop)

This MR contains the following updates:

Package	Type	Update	Change
pytest-asyncio	dev-dependencies	minor	==0.19.0 -> ==0.20.1

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Release Notes

pytest-dev/pytest-asyncio

v0.20.1

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• Fixes an issue that warned about using an old version of pytest, even though the most recent version was installed. #&#8203;430 <https://github.com/pytest-dev/pytest-asyncio/issues/430>_

v0.20.0

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• BREAKING: Removed legacy mode. If you're upgrading from v0.19 and you haven't configured asyncio_mode = legacy, you can upgrade without taking any additional action. If you're upgrading from an earlier version or you have explicitly enabled legacy mode, you need to switch to auto or strict mode before upgrading to this version.
• Deprecate use of pytest v6.
• Fixed an issue which prevented fixture setup from being cached. #&#8203;404 <https://github.com/pytest-dev/pytest-asyncio/pull/404>_

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