Bump pytest from 8.3.3 to 9.1.0

Bumps [pytest](https://github.com/pytest-dev/pytest) from 8.3.3 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@8.3.3...9.1.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

dev-requirements.txt

@@ -1,6 +1,6 @@
 promptflow==1.15.0
 promptflow-tools==1.4.0
-pytest==8.3.3
+pytest==9.1.0
 pytest-cov==5.0.0
 flake8==7.1.1
 pre-commit==3.8.0