Update pytest-asyncio requirement from ^0.20.3 to ^0.21.0

[dependabot]

Updates the requirements on pytest-asyncio to permit the latest version.

Release notes

Sourced from pytest-asyncio's releases.

pytest-asyncio 0.21.0

0.21.0 (23-03-19)

• Drop compatibility with pytest 6.1. Pytest-asyncio now depends on pytest 7.0 or newer.
• pytest-asyncio cleans up any stale event loops when setting up and tearing down the event_loop fixture. This behavior has been deprecated and pytest-asyncio emits a DeprecationWarning when tearing down the event_loop fixture and current event loop has not been closed.

Commits

• 75dccea [docs] Prepare v0.21.0.
• 46b8f9e [build] Tests are run against Python 3.12 (dev). (#514)
• 947e31a Deprecate closing of existing loops (#510)
• e1cc62d Build(deps): Bump pypa/gh-action-pypi-publish from 1.7.1 to 1.8.1 (#513)
• f51948e Build(deps): Bump pypa/gh-action-pypi-publish from 1.6.4 to 1.7.1 (#509)
• 455d945 Build(deps): Bump mypy from 1.0.1 to 1.1.1 in /dependencies/default (#507)
• 108b322 Build(deps): Bump exceptiongroup in /dependencies/default (#508)
• 3d63056 Build(deps): Bump pytest from 7.2.1 to 7.2.2 in /dependencies/default (#506)
• 1dfb3b7 Build(deps): Bump coverage from 7.1.0 to 7.2.1 in /dependencies/default (#505)
• 254bd85 Build(deps): Bump zipp from 3.13.0 to 3.15.0 in /dependencies/default (#504)
• Additional commits viewable in compare view

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[dependabot]

The following labels could not be found: dependencies.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (eb14537) 78.92% compared to head (64285b7) 78.92%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #495   +/-   ##
=======================================
  Coverage   78.92%   78.92%           
=======================================
  Files          14       14           
  Lines        1177     1177           
=======================================
  Hits          929      929           
  Misses        248      248           

Flag	Coverage Δ
unit	78.92% <ø> (ø)

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[dependabot]

A newer version of pytest-asyncio exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.