CompatHelper: bump compat for Flux in [weakdeps] to 0.15 for package DifferentiationInterfaceTest, (keep existing compat)

Author: CompatHelper Julia

DifferentiationInterfaceTest/Project.toml

@@ -46,7 +46,7 @@ DifferentiationInterface = "0.6.0"
 DocStringExtensions = "0.8,0.9"
 ExplicitImports = "1.10.1"
 FiniteDifferences = "0.12"
-Flux = "0.13,0.14"
+Flux = "0.13,0.14, 0.15"
 ForwardDiff = "0.10.36"
 Functors = "0.4, 0.5"
 JET = "0.4 - 0.8, 0.9"