3.16.4

What's Changed

• ci: add python version for cache suffix by @skshetry in #559
• run ci on Python 3.13 by @skshetry in #560
• relink: try to determine iscopy() from metadata if possible by @skshetry in #562
• checkout: reduce makedirs call by caching by @skshetry in #561

Full Changelog: 3.16.3...3.16.4