fix: set descriptor timestamp(s) in SetPrimPart

[tri-adam]

Fixes #271

[codecov-commenter]

Codecov Report

Merging #272 (3d0d786) into main (5a9464b) will increase coverage by 0.01%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   72.72%   72.74%   +0.01%     
==========================================
  Files          35       35              
  Lines        2904     2906       +2     
==========================================
+ Hits         2112     2114       +2     
  Misses        638      638              
  Partials      154      154              

Impacted Files	Coverage Δ
pkg/sif/create.go	72.72% <100.00%> (+0.13%)	⬆️

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