Bump pytest-mock from 3.1.0 to 3.3.0

Bumps [pytest-mock](https://github.com/pytest-dev/pytest-mock) from 3.1.0 to 3.3.0.
- [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@v3.1.0...v3.3.0)

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

test-requirements.txt

@@ -36,7 +36,7 @@ pytest-aiohttp==0.3.0     # via -r test-requirements.in
 pytest-asyncio==0.12.0    # via -r test-requirements.in
 pytest-cov==2.8.1         # via -r test-requirements.in
 pytest-django==3.9.0      # via -r test-requirements.in
-pytest-mock==3.1.0        # via -r test-requirements.in
+pytest-mock==3.3.0        # via -r test-requirements.in
 pytest-mypy==0.6.2        # via -r test-requirements.in
 pytest-sugar==0.9.3       # via -r test-requirements.in
 pytest==5.4.2             # via -r test-requirements.in, pytest-aiohttp, pytest-asyncio, pytest-cov, pytest-django, pytest-mock, pytest-mypy, pytest-sugar