Remove use of venv from container promotion workflow

We no longer use virtualenvs in CI.

Author: markgoddard

.github/workflows/container-promote.yml

@@ -47,7 +47,6 @@ jobs:
         if [[ $CHECK_MODE = true ]]; then
           args="$args --check --diff"
         fi
-        source venv/bin/activate &&
         ansible-playbook -i ansible/inventory \
         ansible/dev-pulp-container-tag-query-kayobe.yml \
         ansible/dev-pulp-container-promote.yml \