CompatHelper: add new compat entry for Mooncake at version 0.4 for package test, (keep existing compat) (#2725)

This pull request sets the compat entry for the `Mooncake` package to
`0.4` for package test.
This keeps the compat entries for earlier versions.



Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass
before you merge this pull request.
Note: Consider registering a new release of your package immediately
after merging this PR, as downstream packages may depend on this for
tests to pass.

Co-authored-by: CompatHelper Julia <compathelper_noreply@julialang.org>

Author: github-actions[bot]

test/Project.toml

@@ -62,6 +62,7 @@ LinearAlgebra = "1"
 LogDensityProblems = "2"
 LogDensityProblemsAD = "1.4"
 MCMCChains = "7.3.0"
+Mooncake = "0.4"
 NamedArrays = "0.9.4, 0.10"
 Optim = "1"
 Optimization = "3, 4, 5"