CompatHelper: bump compat for PosteriorStats to 0.4 for package docs, (keep existing compat)#400

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compathelper/new_version/2025-09-23-01-54-19-594-02220893022arviz-devs/ArviZ.jl:compathelper/new_version/2025-09-23-01-54-19-594-02220893022Copy head branch name to clipboard