Enhancements:
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* Add new key in test section, ``downstreams`` that accepts a list of package specs to test after the current package is built  #2823
* work to prevent unsafe paths in tarballs that would affect paths outside of the work dir  #2822
* simplify all constraints for a given package name to a single constraint that represents the tightest combination of them all  #2694

Bug fixes:
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* fix a misnamed cran skeleton key  #2817
* Remove unused index command in rendering path  #2818
* fix loss of ordering when using recipe_append  #2825
* fix usage of dict for default pin_run_as_build data structure.  Losing ordering created noise down the line for Conda-Forge.  #2830
* fix selector regex being too greedy; reporting wrong used vars  #2832

Contributors:
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* @ceball
* @isuruf
* @jamesabbott
* @jdblischak
* @mingwandroid
* @msarahan