CompatHelper: bump compat for Mooncake in [weakdeps] to 0.5, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Mooncake package from 0.4 to 0.4, 0.5.
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.

[github-actions]

Benchmark Results

Details

Benchmark suite	Current: 82aeb22	Previous: a26e13a	Ratio
normal/RepGradELBO + STL/meanfield/Zygote	2587054528.5 ns	2277394661 ns	1.14
normal/RepGradELBO + STL/meanfield/ReverseDiff	604792918 ns	587041488 ns	1.03
normal/RepGradELBO + STL/meanfield/Mooncake	237996273 ns	194324420 ns	1.22
normal/RepGradELBO + STL/fullrank/Zygote	1983820644 ns	1721338788 ns	1.15
normal/RepGradELBO + STL/fullrank/ReverseDiff	1137131238 ns	1124952832 ns	1.01
normal/RepGradELBO + STL/fullrank/Mooncake	652783924.5 ns	475580576 ns	1.37
normal/RepGradELBO/meanfield/Zygote	1549257205.5 ns	1269400515 ns	1.22
normal/RepGradELBO/meanfield/ReverseDiff	304253706 ns	283960230 ns	1.07
normal/RepGradELBO/meanfield/Mooncake	164725860 ns	143225039 ns	1.15
normal/RepGradELBO/fullrank/Zygote	1054364436 ns	830900437 ns	1.27
normal/RepGradELBO/fullrank/ReverseDiff	576845250 ns	543479258.5 ns	1.06
normal/RepGradELBO/fullrank/Mooncake	538872317 ns	402083150 ns	1.34

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