ci: fix python-test dependency error on merge requests
What does this MR do and why?
Pipeline is unable to run due to the following error:
'python-test' job needs 'debian/x86_64_build' job, but 'debian/x86_64_build' is not in any previous stage
python-test job has the following rule:
- changes:
- bin/ci/**/*
so add it as well to debian/x86_64_build