Update for v1.9 compatability

[MasonProtter]

Should fix failures caused by JuliaLang/julia#45540 and closes #537

[codecov]

Codecov Report

Merging #536 (2d55cff) into master (958213c) will increase coverage by 1.71%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #536      +/-   ##
==========================================
+ Coverage   93.71%   95.42%   +1.71%     
==========================================
  Files          32       32              
  Lines        2227     2230       +3     
==========================================
+ Hits         2087     2128      +41     
+ Misses        140      102      -38     

Flag	Coverage Δ
Pkg.test	94.55% <100.00%> (+4.89%)	⬆️
Run.test	95.20% <100.00%> (+1.64%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/processes.jl	94.21% <ø> (ø)
src/Transducers.jl	73.33% <100.00%> (+1.90%)	⬆️
src/reduce.jl	96.42% <100.00%> (+14.28%)	⬆️
src/threading_utils.jl	100.00% <100.00%> (ø)
src/show.jl	96.71% <0.00%> (+0.65%)	⬆️
src/groupby.jl	92.06% <0.00%> (+1.58%)	⬆️
src/nondeterministic_threading.jl	90.81% <0.00%> (+2.04%)	⬆️
src/library.jl	98.43% <0.00%> (+2.86%)	⬆️
src/interop/onlinestats.jl	91.30% <0.00%> (+4.34%)	⬆️
... and 2 more

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