CompatHelper: bump compat for "MCMCChains" to "6.0"

Author: github-actions[bot]

Project.toml

@@ -40,7 +40,7 @@ DocStringExtensions = "0.9"
 Documenter = "0.27"
 Formatting = "0.4"
 KernelDensity = "0.6"
-MCMCChains = "5.0"
+MCMCChains = "5.0, 6.0"
 MonteCarloMeasurements = "1.0"
 NamedArrays = "0.9"
 NamedTupleTools = "0.13, 0.14"
@@ -58,12 +58,9 @@ Tables = "1.5"
 julia = "1"
 
 [extras]
-#AxisKeys = "94b1ba4f-4ee9-5380-92f1-94cde586c3c5"
 CPUSummary = "2a0fbf3d-bb9c-48f3-b0a9-814d99fd7ab9"
-#ParetoSmooth = "a68b5a21-f429-434e-8bfa-46b447300aac"
 StanSample = "c1514b29-d3a0-5178-b312-660c88baa699"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-#test = ["StanSample", "AxisKeys", "ParetoSmooth", "Test"]
 test = ["StanSample", "Test"]