Bump pytest from 7.1.2 to 7.4.0

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.1.2 to 7.4.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.1.2...7.4.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements_dev.txt

@@ -7,7 +7,7 @@ wheel==0.40.0
 flake8==3.7.8
 tox==4.6.4
 coverage==4.5.4
-pytest==7.1.2
+pytest==7.4.0
 pytest_cov==2.7.1
 Sphinx==2.2.0
 sphinx_rtd_theme==0.4.3