build(deps-dev): bump pytest from 8.3.5 to 8.4.1 in /backend (#2691)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 8.4.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/requirements-dev.txt

@@ -1,5 +1,5 @@
 fakeredis==2.30.2
 pre-commit==4.2.0
-pytest==8.3.5
+pytest==8.4.1
 pytest-responses==0.5.1
 responses==0.25.7