v0.10.1

Bug fix for first, last with cftime & datetime64; and official support for 3.13

What's Changed

• optimize cohorts yet again by @dcherian in #419
• Fix upstream-dev tests by @dcherian in #421
• One more fill-value fix. by @dcherian in #424
• Python 3.13 in CI by @dcherian in #425
• Better cftime handling by @dcherian in #426

Full Changelog: v0.10.0...v0.10.1