Bump pytest-mock from 3.3.1 to 3.4.0

Bumps [pytest-mock](https://github.com/pytest-dev/pytest-mock) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/pytest-dev/pytest-mock/releases)
- [Changelog](https://github.com/pytest-dev/pytest-mock/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-mock@v3.3.1...v3.4.0)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -19,7 +19,7 @@ prometheus_client = "0.8.0"
 psycopg2-binary = "2.8.6"
 py-healthcheck = "1.10.1"
 pytest = "6.2.1"
-pytest-mock = "3.3.1"
+pytest-mock = "3.4.0"
 pytest-cov = "2.10.1"
 python-dateutil = "2.8.1"
 pyyaml = "5.3.1"