Flox

<!-- Release notes generated using configuration in .github/release.yml at main -->

This release brings fixes for cubed, a major improvement to `"cohorts"` with dask, and many bugfixes.

What's Changed
* Cubed fixes by tomwhite in https://github.com/xarray-contrib/flox/pull/416
* Single layer for cohorts. by dcherian in https://github.com/xarray-contrib/flox/pull/415
* Optimize quantile. by dcherian in https://github.com/xarray-contrib/flox/pull/409
* Fix nanmax, nanmin bug by dcherian in https://github.com/xarray-contrib/flox/pull/411
* More support for datetime, timedelta by dcherian in https://github.com/xarray-contrib/flox/pull/412



**Full Changelog**: https://github.com/xarray-contrib/flox/compare/v0.9.15...v0.10.0

Enhancements

* Speed up `var`, `std` by using using numpy_groupies `sum_of_squares` by dcherian in https://github.com/xarray-contrib/flox/pull/135. For this we bump min numpy_groupies to `>= 0.9.19`
* Support reindexing in simple_combine by dcherian in https://github.com/xarray-contrib/flox/pull/177. This is a big improvement when distributed's `worker-saturation` parameter is `inf`. If `1.2` it doesn't really change much.

Bug fixes
* Force reindex to be bool always by dcherian in https://github.com/xarray-contrib/flox/pull/176

**Full Changelog**: https://github.com/xarray-contrib/flox/compare/v0.6.1...v0.6.2

Revert the latest commit to avoid a bug.

What's Changed
* Revert "Support first, last with datetime, timedelta (402)" by dcherian in https://github.com/xarray-contrib/flox/pull/404


**Full Changelog**: https://github.com/xarray-contrib/flox/compare/v0.9.14...v0.9.15

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
* Support first, last with datetime, timedelta by dcherian in https://github.com/xarray-contrib/flox/pull/402


**Full Changelog**: https://github.com/xarray-contrib/flox/compare/v0.9.13...v0.9.14

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
* Faster subsetting for cohorts by dcherian in https://github.com/xarray-contrib/flox/pull/397


**Full Changelog**: https://github.com/xarray-contrib/flox/compare/v0.9.12...v0.9.13

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
* Avoid rechunking when preferred_method="blockwise" by dcherian in https://github.com/xarray-contrib/flox/pull/394
* Fix default int on windows, numpy<2 by dcherian in https://github.com/xarray-contrib/flox/pull/395


**Full Changelog**: https://github.com/xarray-contrib/flox/compare/v0.9.11...v0.9.12