ECONNREFUSED temporary fix

[t-bltg]

See upstream issue JuliaGizmos/Blink.jl#325.
Workaround adapted from Eben60/PackageMaker.jl@297219f.

For JuliaPlots/Plots.jl#5075.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.36%. Comparing base (40caf9c) to head (b00ec83).
Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #499       +/-   ##
===========================================
+ Coverage   28.67%   50.36%   +21.68%     
===========================================
  Files           8        8               
  Lines         265      274        +9     
===========================================
+ Hits           76      138       +62     
+ Misses        189      136       -53     

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