chore(deps-dev): bump pytest from 6.2.3 to 6.2.4

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>

dev-requirements.txt

@@ -1,6 +1,6 @@
 coverage==5.5
 coveralls==3.0.1
-pytest==6.2.3
+pytest==6.2.4
 pytest-cov==2.11.1
 twine==3.4.1
 Sphinx==3.5.4