Bump pytest from 5.4.3 to 6.0.1

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.4.3 to 6.0.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.4.3...6.0.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -35,7 +35,7 @@ pyapp = "^4.3.0"
 aiosmtplib = "^1.1.3"
 
 [tool.poetry.dev-dependencies]
-pytest = "^5.4.3"
+pytest = "^6.0.1"
 pytest-asyncio = "^0.14.0"
 pytest-cov = "^2.10.0"