* Properly resize arrays when adding
The current logic attempts to update the array but, because
append may need to allocate a new array with adequate space,
the code can currently leave dest referring to the old,
under-sized array. The solution is to use the set(dest)
logic that already exists and is used for the IsNull case.
Added a test case that would fail before this fix and now passes.
This fixespulumi/pulumi#5871.
* Add CHANGELOG entry
a5c30f1547