Remove Mooncake test dep (use DPPL compat)

Author: penelopeysm

test/Project.toml

@@ -28,9 +28,6 @@ StableRNGs = "860ef19b-820b-49d6-a774-d7a799459cd3"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
-[weakdeps]
-Mooncake = "da2b9cff-9c12-43a0-ae48-6db2b0edb7d6"
-
 [compat]
 ADTypes = "1"
 AbstractMCMC = "5"
@@ -50,7 +47,6 @@ JET = "0.9, 0.10"
 LogDensityProblems = "2"
 MCMCChains = "6.0.4"
 MacroTools = "0.5.6"
-Mooncake = "0.4.95"
 OrderedCollections = "1"
 ReverseDiff = "1"
 StableRNGs = "1"