CompatHelper: bump compat for Catalyst to 15 for package docs, (keep existing compat)

Author: CompatHelper Julia

docs/Project.toml

@@ -13,7 +13,7 @@ StableRNGs = "860ef19b-820b-49d6-a774-d7a799459cd3"
 StochasticDiffEq = "789caeaf-c7a9-5a7d-9973-96adeb23e2a0"
 
 [compat]
-Catalyst = "14.0"
+Catalyst = "14.0, 15"
 DensityInterface = "0.4"
 DifferentialEquations = "7.11"
 Distributions = "0.25"