CompatHelper: bump compat for Flux to 0.15, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -50,7 +50,7 @@ DataFrames = "1"
 DecisionTree = "0.12.3, 0.12.4"
 Distributions = "0.25.97"
 EnergySamplers = "1.0"
-Flux = "0.12, 0.13, 0.14"
+Flux = "0.12, 0.13, 0.14, 0.15"
 Graphs = "1.11.1"
 JointEnergyModels = "0.1.7"
 LaplaceRedux = "0.1.4, 0.2, 1.0"