Bump pytest-icdiff from 0.7 to 0.8

Bumps [pytest-icdiff](https://github.com/hjwp/pytest-icdiff) from 0.7 to 0.8.
- [Changelog](https://github.com/hjwp/pytest-icdiff/blob/master/HISTORY.rst)
- [Commits](https://github.com/hjwp/pytest-icdiff/commits)

---
updated-dependencies:
- dependency-name: pytest-icdiff
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/testing.txt

@@ -6,7 +6,7 @@ pylint==2.17.5
 pytest==7.4.2
 pytest-asyncio==0.21.1
 pytest-cov==4.1.0
-pytest-icdiff==0.7
+pytest-icdiff==0.8
 ruff==0.0.290
 setuptools==68.2.2
 tox==4.11.3