Test with Julia 1.7

[tkf]

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[codecov]

Codecov Report

Merging #501 (055fbf3) into master (ed41897) will decrease coverage by 0.86%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #501      +/-   ##
==========================================
- Coverage   93.41%   92.55%   -0.87%     
==========================================
  Files          32       32              
  Lines        2217     2215       -2     
==========================================
- Hits         2071     2050      -21     
- Misses        146      165      +19     

Flag	Coverage Δ
Pkg.test	89.62% <ø> (-3.04%)	⬇️
Run.test	92.37% <ø> (-0.91%)	⬇️

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Impacted Files	Coverage Δ
src/reduce.jl	72.56% <0.00%> (-9.89%)	⬇️
src/basics.jl	88.88% <0.00%> (-5.56%)	⬇️
src/partitionby.jl	90.90% <0.00%> (-3.90%)	⬇️
src/core.jl	89.62% <0.00%> (-0.95%)	⬇️
src/progress.jl	91.58% <0.00%> (-0.94%)	⬇️
src/library.jl	95.81% <0.00%> (+0.25%)	⬆️
src/nondeterministic_threading.jl	89.79% <0.00%> (+1.02%)	⬆️

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