Bump pytest from 6.2.3 to 6.2.4 in /tests

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.3 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@6.2.3...6.2.4)

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

Author: dependabot[bot]

tests/requirements.txt

@@ -4,5 +4,5 @@
 
 bandit==1.7.0
 pylama==7.7.1
-pytest==6.2.3
+pytest==6.2.4
 pytest-xdist==2.2.1