Bump pytest-docker from 3.1.0 to 3.1.1 in /tests

Bumps [pytest-docker](https://github.com/avast/pytest-docker) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/avast/pytest-docker/releases)
- [Changelog](https://github.com/avast/pytest-docker/blob/master/CHANGELOG.md)
- [Commits](avast/pytest-docker@v3.1.0...v3.1.1)

---
updated-dependencies:
- dependency-name: pytest-docker
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

tests/requirements.txt

@@ -1,3 +1,3 @@
 pytest==7.4.4
-pytest-docker==3.1.0
+pytest-docker==3.1.1
 requests==2.31.0