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-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

poetry.lock

@@ -19,7 +19,7 @@ Flask-Migrate = "2.5.3"
 prometheus_client = "0.8.0"
 psycopg2-binary = "2.8.5"
 py-healthcheck = "1.10.1"
-pytest = "5.4.3"
+pytest = "6.0.1"
 pytest-mock = "3.2.0"
 pytest-cov = "2.10.0"
 python-dateutil = "2.8.1"