deps(predictor): update pytest requirement in /predictor

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.0.0...9.1.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.1.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

predictor/requirements-test.txt

@@ -2,4 +2,4 @@
 # Test-only dependencies. Kept out of the runtime requirements so the
 # learning pipeline doesn't pull pytest in production. Run the suite with:
 #   python -m pytest predictor/tests
-pytest>=8.0
+pytest>=9.1.1