upper-bound Distributions.jl in tests (#282)

Author: torfjelde

test/Project.toml

@@ -22,7 +22,7 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 AbstractMCMC = "2.1, 3.0"
 AbstractPPL = "0.1.3"
 Bijectors = "0.9.5"
-Distributions = "0.24, 0.25"
+Distributions = "< 0.25.11"
 DistributionsAD = "0.6.3"
 Documenter = "0.26.1, 0.27"
 ForwardDiff = "0.10.12"