Bump pytest-icdiff from 0.6 to 0.9

Bumps [pytest-icdiff](https://github.com/hjwp/pytest-icdiff) from 0.6 to 0.9.
- [Changelog](https://github.com/hjwp/pytest-icdiff/blob/main/HISTORY.rst)
- [Commits](https://github.com/hjwp/pytest-icdiff/commits)

---
updated-dependencies:
- dependency-name: pytest-icdiff
  dependency-version: '0.9'
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

poetry.lock

@@ -26,7 +26,7 @@ packaging = "^24.2"
 [tool.poetry.group.dev.dependencies]
 pytest = "^8.4.2"
 pytest-cov = "^4.0.0"
-pytest-icdiff = "^0.6"
+pytest-icdiff = ">=0.6,<0.10"
 
 [build-system]
 requires = ["poetry-core"]