Use Array.Sort instead of QuickSort.

[bartdesmet]

Also fixes #886.

[codecov]

Codecov Report

Merging #887 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #887      +/-   ##
==========================================
- Coverage   65.53%   65.51%   -0.03%     
==========================================
  Files         168      168              
  Lines       30190    30166      -24     
  Branches    20532    20523       -9     
==========================================
- Hits        19786    19762      -24     
  Misses       2499     2499              
  Partials     7905     7905

Flag	Coverage Δ
#ixnet	65.51% <100%> (-0.03%)	⬇️

Impacted Files	Coverage Δ
...nc/System/Linq/Operators/OrderedAsyncEnumerable.cs	68.62% <100%> (-1.62%)	⬇️

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