Update unicodeplots

[t-bltg]

Following JuliaPlots/UnicodePlots.jl#257.

[codecov]

Codecov Report

Merging #4204 (71dac6d) into master (561839a) will increase coverage by 0.04%.
The diff coverage is 88.46%.

@@            Coverage Diff             @@
##           master    #4204      +/-   ##
==========================================
+ Coverage   77.83%   77.88%   +0.04%     
==========================================
  Files          28       28              
  Lines        7034     7081      +47     
==========================================
+ Hits         5475     5515      +40     
- Misses       1559     1566       +7     

Impacted Files	Coverage Δ
src/backends.jl	68.75% <ø> (ø)
src/consts.jl	100.00% <ø> (ø)
src/pipeline.jl	93.54% <80.00%> (-0.85%)	⬇️
src/args.jl	74.47% <100.00%> (+0.15%)	⬆️
src/axes.jl	85.43% <100.00%> (+0.26%)	⬆️
src/backends/unicodeplots.jl	84.57% <100.00%> (-0.17%)	⬇️
src/recipes.jl	64.27% <100.00%> (+0.03%)	⬆️
src/backends/hdf5.jl	82.30% <0.00%> (-0.31%)	⬇️
src/backends/pgfplotsx.jl	71.13% <0.00%> (-0.12%)	⬇️
src/backends/gr.jl	89.01% <0.00%> (-0.05%)	⬇️
... and 11 more

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