Bump pytest-asyncio from 0.10.0 to 0.12.0 (#331)

Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) from 0.10.0 to 0.12.0.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v0.10.0...v0.12.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -1,5 +1,5 @@
 -r requirements.txt
 coverage
 pytest==5.4.2
-pytest-asyncio==0.10.0
+pytest-asyncio==0.12.0
 pytest-aiohttp==0.3.0