CompatHelper: bump compat for AdvancedHMC in [weakdeps] to 0.8, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -65,7 +65,7 @@ ComradePyehtimExt = "Pyehtim"
 [compat]
 AbstractMCMC = "3, 4, 5"
 Accessors = "0.1"
-AdvancedHMC = "0.6, 0.7"
+AdvancedHMC = "0.6, 0.7, 0.8"
 ArgCheck = "2"
 AstroTime = "0.6,0.7"
 ChainRulesCore = "1"