Update pytest requirement from >=7.0.0 to >=9.1.1

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@7.0.0...9.1.1)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -16,7 +16,7 @@
 # Test stack (DEV_REQUIREMENTS in setup.py)
 flake8==7.3.0
 delta-spark==3.0.0
-pytest>=7.0.0
+pytest>=9.1.1
 coverage>=7.15.4
 pyspark==3.5.5