Revert "Temporarily no-vote the requirements check for openstacksdk"

https://review.openstack.org/#/c/75852/ has merged, the check-requirements job can be re-instated.

This reverts commit f18390317b6c2dce60514a943f4e2f0a438c90d5
Merge "Revert "Temporarily no-vote the requirements check for openstacksdk""