ENH: Add month cooldown window for new package uploads (#162)

* ENH: Add month cooldown window for new packages

* To weakly guard against security issues that are introduced in new
  uploads to conda-forge, add a 30 day exclusion window for Pixi's resolver.
* This feature was introduced in Pixi v0.67.0, so require at least that for use.

* MNT: Update anaconda-client to v1.14.1

* MNT: Update lock file

Author: matthewfeickert