Bump pytest from 6.2.2 to 6.2.4

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.2 to 6.2.4.
- [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...6.2.4)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

tests/requirements.txt

@@ -5,7 +5,7 @@ flake8==3.9.1
 isort==5.7.0
 pycodestyle==2.7.0
 pyflakes==2.3.1
-pytest==6.2.2
+pytest==6.2.4
 pytest-aiohttp==0.3.0
 pytest-cov==2.11.1
 pytest-isort==1.3.0