Test with Julia 1.7

[tkf]

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[codecov]

Codecov Report

Merging #12 (4c506a0) into master (1ad9a41) will decrease coverage by 0.54%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
- Coverage   80.26%   79.71%   -0.55%     
==========================================
  Files           8        8              
  Lines         765      784      +19     
==========================================
+ Hits          614      625      +11     
- Misses        151      159       +8     

Flag	Coverage Δ
unittests	79.71% <ø> (-0.55%)	⬇️

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

Impacted Files	Coverage Δ
src/stack.jl	89.28% <0.00%> (-6.87%)	⬇️
src/msqueue.jl	77.77% <0.00%> (-3.62%)	⬇️
src/utils.jl	65.41% <0.00%> (-0.75%)	⬇️
src/dict.jl	80.00% <0.00%> (+0.04%)	⬆️
src/workstealing.jl	91.08% <0.00%> (+0.08%)	⬆️

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