Use new environment for Julia 1.6

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #209 (3d4bdc0) into master (85f6ec6) will increase coverage by 0.89%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
+ Coverage   90.10%   90.99%   +0.89%     
==========================================
  Files          22       22              
  Lines         495      511      +16     
==========================================
+ Hits          446      465      +19     
+ Misses         49       46       -3     

Flag	Coverage Δ
unittests	90.99% <ø> (+0.89%)	⬆️

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

Impacted Files	Coverage Δ
src/extras.jl	100.00% <0.00%> (ø)
src/BangBang.jl	100.00% <0.00%> (ø)
src/NoBang/NoBang.jl	100.00% <0.00%> (ø)
src/NoBang/base.jl	90.36% <0.00%> (+0.36%)	⬆️
src/dataframes_impl.jl	92.68% <0.00%> (+0.57%)	⬆️
src/setfield.jl	91.66% <0.00%> (+0.75%)	⬆️
src/base.jl	83.89% <0.00%> (+0.99%)	⬆️
src/NoBang/singletoncontainers.jl	100.00% <0.00%> (+4.00%)	⬆️
src/macro.jl	100.00% <0.00%> (+5.26%)	⬆️

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