Bump pytest from 6.2.2 to 6.2.3 (#21)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.2 to 6.2.3.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.2.2...6.2.3)

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]

poetry.lock

@@ -29,7 +29,7 @@ quart = ">=0.13,<0.15"
 black = "^21.4b2"
 
 # tests
-pytest = "^6.2.2"
+pytest = "^6.2.3"
 pytest-asyncio = "^0.14.0"
 pytest-cov = "^2.11.1"