Add setup.py support

What does this MR do?

Update Go dependency analyzers/gemnasium-python in order to detect Python projects having a setup.py file and no dependency file compatible with pip or pipenv.

This also updates the expected report, though this has nothing to do with setup.py support. See broken QA job on master branch.

What are the relevant issue numbers?

gitlab-org/gitlab#11244 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
  • See gitlab-org/gitlab!16614 (merged)
• [-] Documentation created/updated for this project, if necessary
• [-] Documentation reviewed by technical writer or follow-up review issue created
• [-] Tests added for this feature/bug
  • See QA job with small diff; Pillow had to be removed because it can't be installed without having a dedicated build job.
  • See non-regression QA job; SP_VERSION was set to ee-11244-setup.py when creating the pipeline
• [-] Job definition updated, if necessary
• [-] Conforms to the code review guidelines
• [-] Conforms to the Go guidelines
• [-] Security reports checked/validated by reviewer