Bump pytest in /backend in the pip group across 1 directory (#391)

Bumps the pip group with 1 update in the /backend directory: [pytest](https://github.com/pytest-dev/pytest).


Updates `pytest` from 9.0.2 to 9.0.3
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@9.0.2...9.0.3)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.0.3
  dependency-type: direct:production
  dependency-group: pip
...

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

Author: dependabot[bot]

backend/Pipfile

@@ -43,7 +43,7 @@ pygments = "==2.19.2"
 pylint = "==3.3.9"
 pylint-django = "==2.7.0"
 pylint-plugin-utils = "==0.9.0"
-pytest = "==9.0.2"
+pytest = "==9.0.3"
 pytest-cov = "==7.0.0"
 pytest-django = "==4.12.0"
 pytz = "==2026.1.post1"