Revert workaround for Julia 1.8-DEV

[tkf]

see also JuliaFolds/Transducers.jl#502

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.97%. Comparing base (b800958) to head (b002717).
Report is 33 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   95.56%   95.97%   +0.41%     
==========================================
  Files           5        5              
  Lines         609      597      -12     
==========================================
- Hits          582      573       -9     
+ Misses         27       24       -3     

Flag	Coverage Δ
Pkg.test	93.79% <ø> (ø)
Run.test	89.82% <ø> (+0.38%)	⬆️

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[tkf]

Fri, 24 Dec 2021 07:15:24 GMT
[ Info: Precompiling... DONE
Fri, 24 Dec 2021 07:15:25 GMT
[ Info: Running /home/runner/work/FLoops.jl/FLoops.jl/test/runtests.jl
Fri, 24 Dec 2021 08:35:03 GMT
Error: The operation was canceled.

https://github.com/JuliaFolds/FLoops.jl/runs/4625024989?check_suite_focus=true#step:6:32