Update dependency pytest-asyncio to v0.21.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pytest-asyncio (changelog)	==0.21.0 -> ==0.21.1

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Release Notes

pytest-dev/pytest-asyncio (pytest-asyncio)

v0.21.1: pytest-asyncio 0.21.1

Compare Source

0.21.1 (2023-07-12)

• Output a proper error message when an invalid asyncio_mode is selected.
• Extend warning message about unclosed event loops with additional possible cause.
  #​531
• Previously, some tests reported "skipped" or "xfailed" as a result. Now all tests report a "success" result.

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