build: bump SII compat

Author: AayushSabharwal

Project.toml

@@ -149,7 +149,7 @@ SpecialFunctions = "0.7, 0.8, 0.9, 0.10, 1.0, 2"
 StaticArrays = "0.10, 0.11, 0.12, 1.0"
 StochasticDelayDiffEq = "1.8.1"
 StochasticDiffEq = "6.72.1"
-SymbolicIndexingInterface = "0.3.37"
+SymbolicIndexingInterface = "0.3.39"
 SymbolicUtils = "3.25.1"
 Symbolics = "6.37"
 URIs = "1"