Fix broken test

Author: penelopeysm

test/mcmc/gibbs.jl

@@ -598,7 +598,7 @@ end
         @model function dynamic_model_with_dot_tilde(
             num_zs=10, ::Type{M}=Vector{Float64}
         ) where {M}
-            z = M(undef, num_zs)
+            z = Int(undef, num_zs)
             z .~ Poisson(1.0)
             num_ms = sum(z)
             m = M(undef, num_ms)