build(deps-dev): bump pytest from 8.0.2 to 8.2.1 in /backend (#2305)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 8.0.2 to 8.2.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.0.2...8.2.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

backend/requirements-dev.txt

@@ -1,5 +1,5 @@
 fakeredis==2.21.1
 pre-commit==3.5.0
-pytest==8.0.2
+pytest==8.2.1
 pytest-responses==0.5.1
 responses==0.25.0