Format with Black 23.1.0

[hugovk]

Black 23.1.0 has been released with a new stable style for 2023:

• https://github.com/psf/black/releases/tag/23.1.0
• https://ichard26.github.io/blog/2023/01/black-23.1.0/

This formats the code with the new version, which fixes the check on the CI.

Before: https://github.com/hugovk/sphinxext-opengraph/actions/runs/4062858491/jobs/6994400880

After: https://github.com/hugovk/sphinxext-opengraph/actions/runs/4062869689/jobs/6994425004