Log Message:
py-wand: update to 0.6.13.

0.6.13

🤦 Hotfix release to remove a "work-in-progress" pyproject.toml file
that was mistakenly included with Wand 0.6.12 sdist package.

0.6.12

The 0.6.12 release includes some minor bug fixes, adds a few
composite operators, and updates Sphinx build versions (used for
documentation).