Skip docker system test for bert example

[xiaoyu-work]

Describe your changes

Skip docker system test for bert example until bug is fixed: docker/docker-py#3113

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Format your code by running pre-commit run --all-files

(Optional) Issue link

[jambayk]

Thanks!

I think if the next docker release is going to take time, we might have to do the temporary solution of pinning urllib3 and requests for docker extra to make docker system usable.