chore(deps): bump backoff from 1.10.0 to 1.11.1 in /test/requirements

Bumps [backoff](https://github.com/litl/backoff) from 1.10.0 to 1.11.1.
- [Release notes](https://github.com/litl/backoff/releases)
- [Changelog](https://github.com/litl/backoff/blob/master/CHANGELOG.md)
- [Commits](https://github.com/litl/backoff/compare/v1.10.0...v1.11.1)

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

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

test/requirements/python-requirements.txt

@@ -1,4 +1,4 @@
-backoff==1.10.0
+backoff==1.11.1
 docker-compose==1.28.5
 docker==4.4.4
 pytest==6.2.2