Bump pytest-asyncio from 0.14.0 to 0.15.1 (#450)

Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) from 0.14.0 to 0.15.1.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v0.14.0...v0.15.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Stéphane Wirtel <[email protected]>

Author: dependabot[bot]

dev-requirements.txt

@@ -1,7 +1,7 @@
 -r requirements.txt
 coverage
 pytest==6.2.4
-pytest-asyncio==0.14.0
+pytest-asyncio==0.15.1
 pytest-aiohttp==0.3.0
 pytest-cov==2.11.1
 codecov==2.1.11