Merge pull request #2058 from nginx-proxy/dependabot/pip/test/requirements/backoff-2.2.1

chore(deps): bump backoff from 1.11.1 to 2.2.1 in /test/requirements

test/requirements/python-requirements.txt

@@ -1,4 +1,4 @@
-backoff==1.11.1
+backoff==2.2.1
 docker-compose==1.29.2
 docker==5.0.3
 pytest==7.2.0