build(deps-dev): bump pytest-icdiff from 0.8 to 0.9

Bumps [pytest-icdiff](https://github.com/hjwp/pytest-icdiff) from 0.8 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-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements-dev.txt

@@ -29,7 +29,7 @@ pre-commit == 2.21.0
 pytest == 7.4.3
 pytest-cov == 3.0.0
 pytest-forked == 1.6.0
-pytest-icdiff == 0.8
+pytest-icdiff == 0.9
 pytest-random-order == 1.1.0
 pytest-socket == 0.6.0
 pytest-sugar == 0.9.7