Fix the incorrect Libtask bound

Author: devmotion

Project.toml

@@ -15,7 +15,6 @@ ZygoteRules = "700de1a5-db45-46bc-99cf-38207098b444"
 AbstractMCMC = "1.0"
 Bijectors = "0.5.2, 0.6, 0.7"
 Distributions = "0.22, 0.23"
-Libtask = "0.3"
 MacroTools = "0.5.1"
 ZygoteRules = "0.2"
 julia = "1"