build(deps): bump pytest from 9.0.3 to 9.1.0 in /requirements (#1384)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 9.0.3 to 9.1.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@9.0.3...9.1.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.1.0
  dependency-type: direct:production
  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]

requirements/requirements.txt

@@ -3,7 +3,7 @@ scipy == 1.17.1
 matplotlib == 3.10.8
 cvxpy == 1.8.1
 ecos == 2.0.14
-pytest == 9.0.3 # For unit test
+pytest == 9.1.0 # For unit test
 pytest-xdist == 3.8.0 # For unit test
 mypy == 1.19.1 # For unit test
 ruff == 0.15.16 # For unit test