Revert fix for failing CI

[t-bltg]

Merge this PR when:

• Fix plotting of discrete distributions StatsPlots.jl#454 is merged;
• New release of https://github.com/JuliaPlots/StatsPlots.jl;
• CI is clear of errors.

EDIT: Those are in fact not needed:

1. Fix #1358 JuliaStats/Distributions.jl#1359 is merged;
2. New release of https://github.com/JuliaStats/Distributions.jl;

Fix JuliaStats/Distributions.jl#1358.

[t-bltg]

@BeastyBlacksmith there is also the possibility to temporarily change Distributions = "< 0.25.7, ≥ 0.25.9" to Project.toml in github.com/JuliaPlots/StatsPlots.jl to bypass github.com/JuliaStats/Distributions.jl.

[codecov]

Codecov Report

Merging #3611 (a8e3676) into master (ef93aa8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3611   +/-   ##
=======================================
  Coverage   65.19%   65.19%           
=======================================
  Files          27       27           
  Lines        6663     6663           
=======================================
  Hits         4344     4344           
  Misses       2319     2319           

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