CompatHelper: bump compat for MCMCChains in [weakdeps] to 7, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -64,7 +64,7 @@ JET = "0.9, 0.10"
 KernelAbstractions = "0.9.33"
 LinearAlgebra = "1.6"
 LogDensityProblems = "2"
-MCMCChains = "6"
+MCMCChains = "6, 7"
 MacroTools = "0.5.6"
 Mooncake = "0.4.95"
 OrderedCollections = "1"