Bump Libtask version

Author: penelopeysm

Project.toml

@@ -66,7 +66,7 @@ DynamicHMC = "3.4"
 DynamicPPL = "0.29"
 EllipticalSliceSampling = "0.5, 1, 2"
 ForwardDiff = "0.10.3"
-Libtask = "0.7, 0.8"
+Libtask = "0.8.8"
 LinearAlgebra = "1"
 LogDensityProblems = "2"
 LogDensityProblemsAD = "1.7.0"