Fix test errors (#479)

* Fix `stack` test errors

* Update Bijectors compat

Author: devmotion

Project.toml

@@ -24,7 +24,7 @@ ZygoteRules = "700de1a5-db45-46bc-99cf-38207098b444"
 AbstractMCMC = "2, 3.0, 4"
 AbstractPPL = "0.5.3"
 BangBang = "0.3"
-Bijectors = "0.11, 0.12"
+Bijectors = "0.12.4"
 ChainRulesCore = "0.9.7, 0.10, 1"
 ConstructionBase = "1"
 Distributions = "0.23.8, 0.24, 0.25"

src/test_utils.jl

@@ -686,7 +686,7 @@ Simple model for which [`default_transformation`](@ref) returns a [`StaticTransf
 end
 
 function DynamicPPL.default_transformation(::Model{typeof(demo_static_transformation)})
-    b = Bijectors.stack(Bijectors.elementwise(exp), identity)
+    b = Bijectors.Stacked(Bijectors.elementwise(exp), identity)
     return DynamicPPL.StaticTransformation(b)
 end