Bump pytest from 7.1.2 to 7.2.0 in /backend

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.1.2 to 7.2.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/7.1.2...7.2.0)

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

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

backend/requirements.txt

@@ -5,7 +5,7 @@ greenlet==1.1.2
 python-engineio==3.14.2
 python-socketio==4.6.1
 six==1.16.0
-pytest==7.1.1
+pytest==7.2.0
 requests==2.27.1
 discord-webhook==0.15.0
 datadog==0.44.0